Why are some 7-watt night light bulbs much brighter than other 7-watt bulbs?


Asked by brab 8 years ago  |  last reply 8 years ago

Projecting outside: colours?

Is there a way to get colours to be more contrasted so that they can be seen more clearly? I want to take this: https://www.instructables.com/id/PROJECTION-BOMBING/ and turn it into this: http://www.gregbernstein.tv/walmartwatch/ Also, is there a way to increase the lumens of a projector by changing the bulb or something? I have a feeling my projector isn't bright enough to project outside. I was thinking of using this: https://www.instructables.com/id/Halogen-Work-Light-Projector-Mod/ Would that be bright enough for outdoors projecting or is there another cheap alternative?

Asked by 123fakestreet 9 years ago

luminous flux vs intensity for wall lighting? Answered

Forgive me if this is an elementary question; I have very little understanding of optical physics.  Asusming that's even what this pertains to. Anyhow, I'm designing a music responsive LED display.  The gist of it is that the LEDs will be angled towards the wall slightly, with the intent being to use the wall as a sort of canvas for the light. I know flux somehow pertains to the general light emitted/spread, and intensity to the intensity at the point of emission. Unfortunately, my grasp pretty well ends there. As such, as I go to purchase LEDs, I'm unsure of which of the two is more important for my project (as it seems I can't have a maximum of both for my price range).  So my question is such:  Which factor (flux or intensity) will create a bolder impact in the context of visibly lighting the wall?  Keeping in mind that I don't intend or need to light the room itself, merely create the boldest display on the wall.  Thanks for helping a novice!  

Asked by Skidion 7 years ago  |  last reply 7 years ago

How Bright is a 112 Lm/W LED? Answered

Hello, I am on a mission to find a very very bright led preferably in red. I have seen lots of bulbs with ranging prices but don't understand how bright they are. One led I have seen is the Luxeon Rebel LXM5-PD01 which comes in red and is 112 Lm/W, I understand that it means 112 lumens per watt but how bright actually is that? And what would be its power consumption? Thanks

Asked by Boba Jett 3 years ago  |  last reply 3 years ago

5 mm led's 8 LUMENS PER WATT!?!?!? [answered] Answered

Well i was thinking, 5mm LED's take about 1/10 of a watt, correct?  and from this calculator found out Cree 5mm led's are .806 lumen's. i assume they are 1 tenth of a watt. well, my calculator states they are 8 lumen's per watt (if i could run them at a watt.)  i figure they are 1/10 of a watt because because this 500 led light makes takes about 50W as in the video and led's give less than a lumen of light. so far, it seems leds just last long and emit blueish light. is incandescent light better? with 20 lumens per watt from halogen?

Asked by -max- 7 years ago  |  last reply 6 years ago

LDR Calibration ?

I am planning to build a lumenmeter but I am not getting how to calibirate the LDR and do not have any lumen meter so if could tell the estimate lumens out of a 5w CFL or any other device might help

Asked by Bot1398 6 years ago  |  last reply 6 years ago

hey can anyone give me a list of cree leds (lumens,volt,power etc. ?

I am looking for a cree led with a lumens of about 1000 lm(cool white).Pls suggest a site suitable for purchasing these items if you could,,

Asked by Adarsh_tronix 6 years ago  |  last reply 6 years ago

How good of a projector do I need for projecting movies outside at night?

Going to try to set up an outdoor movie theater in my backyard.  If I was only going to use the projector at night, how bright of a projector would I need?  From articles I've seen, 2000 lumens is the usual answer.  I'm just wondering if I could get away with 1000-1500 lumens because the projectors I've seen that can output 2000 lumens aren't that cheap.... So could I get away with less than 2000 lumens?  And can anyone recommend any projectors that work well outdoors that are on the cheaper side?

Asked by texpert 2 years ago  |  last reply 2 years ago

Does anyone know the current best LED for Lumen vs. watts?

I would like to get a few of these for a project. It would be nice if there is a ebay seller that can give a deal. there was a guy that found this out, but that was a year ago.

Asked by JZ Price 9 years ago

how to add usb port to this flash ligt?

Ive got this flashlight. my questions are? 1. how can i add usb port to this flash light? 2. it got 3 AAA battery and i used rechargeable. how do i be able to recharge the battery using usb? 3. what is this flash light? a led? lumen? laser? never those backgrounds... ;)

Asked by iamsinned06 8 years ago  |  last reply 8 years ago

How would I make a 2000+ lumen white LED circuit?

I'm thinking of using https://www.instructables.com/id/Circuits-for-using-High-Power-LED-s/step8/a-little-micro-makes-all-the-difference/ so I can drive the circuit with a TTL pulse and three of http://www.ledsupply.com/creexpg-w417.php, but I'm not entirely sure on how to wire up the circuit/choose the correct values for the components. Any help would be awesome!

Asked by bwee 7 years ago  |  last reply 7 years ago

Is it safe to put a really powerful lamp in a 2000 lumen DLP projector?

I bought my Mitsubishi SD205U projector used. Eventually, the bulb is going to fail, and I want to know some stuff before it dies. I plan on buying an LED, driver, and heatsink off of Ebay, and modding the projector to use it. The best lens I can find it 60-80 degrees. A bunch of the light will go into the projector, will this damage anything? And other than the wasted light, will it hurt the image quality? Next question, can I put a much more powerful LED in it without damaging anything? Finally, is there anything I should know of before attempting this project?

Posted by laptopdude90 4 years ago  |  last reply 4 years ago

(newsletter) Kilo-Lumen Bike Light, Sparkleball, Amazing Pumpkin Pie...

Nov 26, 2008 Sign-up for this newsletter: function openSubscribePopUp(src){ var emailValidate = /\w{1,}[@][\w\-]{1,}([.]([\w\-]{1,})){1,3}$/ if(emailValidate.test(src.value) == false){ alert("Please enter correct email"); return; } window.open("/newsletter/newslettersignup?email=" + src.value,"newslettersignup1","status=yes,scrollbars=yes,resizable=yes,width=420,height=250"); } Welcome back! Making something sweet for the holidays? Then enter it in the Holiday Treats Contest and win a custom laser-etched rolling pin! Show us your best creation powered by AA, AAA, C, or D batteries and win a full set of eneloop rechargeable batteries in the SANYO eneloop Battery Powered Contest! Color a robot and send it in to help us decorate Eric's office!Coming very soon... our biggest contest yet! Any project using tools will be eligible, so start tinkering now! (no-melt) Sparkleball by sparkleball_lady Perfect Oven Sweet Potato Fries by jessyratfink Cook a Huge Dinner w/ Spreadsheets by canida Kilo-Lumen bike headlight by kc6qhp Win a sweet set of rechargeable batteries! Win a custom laser-engravedrolling pin! Homemade Flavored Marshmallows by cainunable Build a Greenhouse for under $25 by PondPlantGirl Turn a Photo into a Stencil! by Weissensteinburg Amazingly Smooth Pumpkin Pie by ewilhelm "Dead" Battery Lamp by zjharva Arduino Controlled Servo Robot by Stuart.Mcfarlan Modular Pie-cosahedron by turkey tek Bicycle Oil Lantern by alpacalypse Make a gift special with these customizable Instructables Vote for your favorites! How to make Soft Drinks by SFHandyman Bench Saw Table for a Wood Lathe by Phil B Cranberry Relish by LasVegas Hard Drive Persistence of Vision by vishnubob Now go make something awesome, and I'll see you next week! - Eric Sign-up for this newsletter: function openSubscribePopUp(src){ var emailValidate = /\w{1,}[@][\w\-]{1,}([.]([\w\-]{1,})){1,3}$/ if(emailValidate.test(src.value) == false){ alert("Please enter correct email"); return; } window.open("/newsletter/newslettersignup?email=" + src.value,"newslettersignup2","status=yes,scrollbars=yes,resizable=yes,width=420,height=250"); }

Posted by fungus amungus 10 years ago

Which Lasers Flashlight on Everbuying should i buy?

links: http://www.everbuying.com/UltraFire-WF-501B-SSC-P7-CSXO-3-Mode-900-Lumen-Memory-LED-Flashlight-with-Strap-p-24295.html http://www.everbuying.com/Fenix-TK12-HA-III-Cree-Q5-2-Mode-280-Lumen-LED-Flashlight-Set-p-27782.html http://www.everbuying.com/200mW-532nm-Adjustable-Green-Laser-Pointer-p-22062.html http://www.everbuying.com/30mW-532nm-Blue-Beam-Laser-Pointer-p-27799.html  

Asked by stella1740 8 years ago  |  last reply 6 years ago

cheap LED sources

Hey everybody, I've been looking for a good source for cheap LEDs for a project I'm working on. I want to replace 14 different 60W halogen bulbs with home-built LED lights. The reason for home-built is that the halogens burn out like crazy, but the light fixture looks nice, and isn't going to be replaced. The halogens put out an estimated 500-700 lumens (from the google research I did)So.... I'm looking for the best deal for white leds per lumen. the best deal I've found so far is:http://www.phenoptix.co.uk/Ultra_Bright_White_SUPERFLUX_LEDs_3000mcd_p/whi-flux-3000.htmat .021cents/lumen from the brightness calculator http://led.linear1.org/lumen.wizbut considering the quantity I want.... there's not even enough room to fit those LEDs on the fixture (due to the large case size)or if I buy 1000 of them (about the quantity I'm looking for) I'd be getting a slightly better deal, but still coming in at $120, not to mention they still don't fit. The physical space for the leds is a cylinder with a diameter of about 30mm and a height of about 70mm. Any Ideas/suggestions for cheap white LEDs?Thanks!-Zaen

Posted by Zaen 10 years ago  |  last reply 9 years ago

Led stroboscope help

I success to make a led stroboscope with an arduino uno and a 50watt high power led. but the problem was with the lumen of the led. the on time duration of the led is 500 microsecond and the led intensity is poor. i don't know how to make it and maintain the intensity of the led. note that i used a driver for the led "32vdc" and the led is 32vdc .

Asked by hamada_bio 1 year ago  |  last reply 1 year ago

recommendation for LED brightness? Answered

I am making an LED suit that has to be visible in low-light environments, like night or in a cave. (fog, smog, and rain not taken into account) any recommendations for a good brightness? how many lumens? it has to be visible so a car can see the wearer of the LED clothing, so the wearer doesn't get hit.

Asked by Gaudnarok 2 years ago  |  last reply 2 years ago

where can i get a CRE LED DRIVER CHIP?

I am interested in getting driver chips for CREE LED LAMPS. I would like to get hi power  source of 6000 --- 8000 lumen s LED lamp for using as a projection lamp. I would like any novel ideas or suggestions.

Asked by fxaugustine 8 years ago  |  last reply 7 years ago

I'd like to challenge everyone here that makes useful things.

I'd like to challenge everyone here that makes useful things.  I'm rebuilding an old light fixture and I'm focusing on efficiency.   My challenge is to get the highest amount of lumens with the lowest number of watts.  I'm stuck and I'd be willing to put a cash prize on this. I'd like for everyone that gives this a try to stick to DC voltage.

Posted by 00MrNotWrong00 8 years ago  |  last reply 8 years ago

I want to project pictures printed of proyector paper in a wall i was thinking to use leds.?

I have seen this page http://www.buy-leds-online.com/all_leds.html but i don't know small led or bigger ones ...? how i can determine how much light a LED can give a had read that a proeyector needs at least 1500 lumenes .... did i need so many ?

Asked by ldbarragan 8 years ago  |  last reply 7 years ago

How do i make these leds dance to music? Answered

I want to hook the three led's i have up to my PC sound jack, i have parts, i may need more, but my question is how do i hook them up? please leave comments and or diagrams thank you What I have (for now) 3 Leds: 1 WATT ULTRA BRIGHT LED GREEN 45/ 73 Lumens @ 350/ 700 mA 100 degree viewing angle Maximum forward voltage: 4 Vdc Maximum forward current: 350/ 700 mA 1 WATT ULTRA BRIGHT LED BLUE 19/ 31 Lumens @ 350/ 700 mA 100 degree viewing angle Maximum forward voltage: 4 Vdc Maximum forward current: 350/ 700 mA 1 WATT ULTRA BRIGHT LED RED 34/ 55 Lumens @ 350/ 700 mA 100 degree viewing angle Maximum forward voltage: 4 Vdc Maximum forward current: 350/ 700 mA   TIP31 80V TO-220 Transistor (is this the correct one?) i have 3 i also have 24g hook up wire, 3.5 splitter, 3.5 cable with plugs, many battery options as well as wall adapters OK do i have what i need, do i need resistors, what ohm rating, and watt rating, what volt source?  i dont need it to be portable, will be on desk, a wall power supply would be best, please try to make me a diagram with parts i have, but if more are needed i have plenty of resistors to choose from Ty. and a store right down road :) https://www.instructables.com/answers/I-need-a-diagram-please-from-a-knowledgeable-pers/

Asked by dougiedougworld 8 years ago  |  last reply 8 years ago

Need help with LED lighting. Answered

Trying to make a bright LED light for application with a dental loupe.   I see tons of LEDs and diodes and new flip chip technology. It's all very confusing. I'm basically trying to make the brightest light in the smallest application. It will be mounted on a pair of glasses with a set of loupes on them. I don't want the diameter to be any more than 1 inch.   I found a website that can cut a lens to any dimension I desire. I basically want a spot beam that will be about 5 inches in diameter from about 18 inches in distance. It will have to run off some sort of battery pack.   I was thinking of just taking a LED bulb element from a flashlight and slapping a lens in front of it to focus the light. Really not sure what type of LED bulb to buy or if it might be better to build my own. I see companies advertising their LED dental loupe light at 8,000 lumens which seems fairly impossible since most diodes seem to only be rated at 100 or 200 lumens at the most. Any advice or guidance would be greatly appreciated. Thanks in advance.... Gabor

Asked by gadorjan 9 years ago  |  last reply 9 years ago

RGB LED strip quiestion :)

Hi everybody, I saw a tutorial on how to make led light-bulb , https://www.instructables.com/id/21-W-Led-Bulb-1450-Lumens/ , this one. I have a led strip which i can use, the only problem , the strip is RGB , and i want it to give of white light. i don't have a controller for them, and i don't really want to use one. So my question is : can i wire them in some way to give of white light ? Thanks.

Posted by maniak.loop 4 years ago  |  last reply 4 years ago

modify an LED circuit? Answered

Re: I am trying to modify the circuit shown in the image to adapt to a new power source The LED's are 10 mm  and 8 in number but I am unaware about the forward current and sorry about the previous details it was my error that i typed i there drop voltage although i have the pictures showing brightness and believe me it outputs about 50 lumen I think so! and the LED's don't get hot or don't show any signs of burning I am quite new to this part of electronics Please Help :)(

Asked by MYawar 5 years ago  |  last reply 5 years ago

LED lighting capable of reef aquariums?

Using 5m 420nm to 680nm blue and red LED getting enough "light" past 18 inches of water to allow live rock and coral growth. How many LED's are needed? Has anyone else done it? Ridiculous is the price as soon as you put the word hydroponics or aquarium on a item. Like some help building one 36"x 12" that would pentrate 18" of water at what 3000 lumens? Pars? Buying "supplies" here in Kanada is another use of that "R" word.

Asked by peninbrant 9 years ago  |  last reply 8 years ago

LED Grow Lights

I've been an avid rosarian for many years, and am finally getting around to trying to grow miniatures indoors. I've been looking at some of the commercially available LED grow-lights, and they're insanely expensive, not to mention bulky and unattractive. It occurred to me that a lot of the info here would be highly relevant to such a DIY project. What I'm wondering is how many LEDs would be needed to produce around 2000 lumens in an approximately 1-foot square for one rose? I'd gladly listen attentively to anyone who can comment on this with some degree of authority.

Posted by Cavallo 11 years ago  |  last reply 3 years ago

How to cut a LED Strip by not the marks provided?

I'm lookin for a LED strip very special. 24V RGB 60 LED/m 1800 lumens / m IP 20 Trimmable each 5 cm. HERE COME THE ''PROBLEMO'' (Terminator) Every body offers to me each 10cm but it's imposible for us use that one. when I say everybody believe me  that I asked a lot of suppliers. Do you know how to cut a LED strip wherever you want??? Not in the marks provided? Best, Crazybirzzz

Asked by crazybirzzz 3 years ago  |  last reply 3 years ago

Are there Dremel attachment(s) meant for removing or shaping solid aluminum? Answered

First, I'll explain the background for my question.  I've been meaning to make a 1000 lumen Maglite (Jayrob from CandlePowerForums conceived the design-look it up, it's awesome).  I can get the heatsink from CPF vendors but they come with a 14.5mm diameter pedestal.  I want to reduce the diameter of the pedestal, ideally to less than 12.5mm in order to use a reflector with a smaller hole. So, which Dremel rotary tool attachment(s) would be appropriate for removing and/or 'shaping' aluminum?  Any ideas, other suggestions, or musings?  Thanks.

Asked by OmniWrench8000 7 years ago  |  last reply 7 years ago

Strongest 3V LED with pins?

I'd like to build a LED into an empty light bulb that can run on 3V (from button cells). So I can't use the normal screw-in leds that are sold because they are all 12V at least. I'm planning to build the LED into the lightbulb myself, and connect it manually to the batteries. I'd like my LED to be as omnidirectional as possible. So what LED would I be able to use for this, and would I need some sort of diffuser or something to make the light shine in all directions? Would I be able to get up to about similar lumens as a 40W incandescent bulb?

Asked by reinhardtsmit 4 years ago  |  last reply 4 years ago

I need a diagram, please from a knowledgeable person, can any one make me a diagram for leds to sync to music please? Answered

I need a diagram. i have parts and will pick up more if needed, please specify what voltages, ohms, needed as well if heat sinks are needed,  Parts i have. One of each of the following leds. surface mount LED is mounted on a 0.80" diameter aluminum disk which serves as a heatsink and provides solder spots to simplify connection. Cree X Lamp 7090,  1 WATT GREEN ULTRA-ULTRA BRIGHT LED 45/ 73 Lumens @ 350/ 700 mA 100 degree viewing angle Maximum forward voltage: 4 Vdc Maximum forward current: 350/ 700 mA Cree XLamp 7090,  1 WATT BLUE ULTRA-ULTRA BRIGHT LED 19/ 31 Lumens @ 350/ 700 mA 100 degree viewing angle Maximum forward voltage: 4 Vdc Maximum forward current: 350/ 700 mA Cree XLamp(TM) 7090, 1 WATT RED ULTRA-ULTRA BRIGHT LED 34/ 55 Lumens @ 350/ 700 mA 100 degree viewing angle Maximum forward voltage: 4 Vdc Maximum forward current: 350/ 700 mA I have 3  Tip31 NPN TRANSISTOR, 3A 80V TO-220 I have One 12' CABLE, 3.5 MM STEREO PLUGS BOTH ENDS i have one  Stereo plug splitter ( so i can listen to music while lights are going) I have 100' of red and 100' of black 24Ga hook up wire i also have, solder, solder gun, wire snips/strippers, access to resistors and power supplies, volt meter/ohm meter, and other tools I would like it to be a wall plug system using an adapter The leds were about $10 per so please give me real diagrams, dont waste my time or money. I will be double checking the diagram, and checking to make sure all math is correct, will i need resistors and what type, will i need heat sinks even tho the leds already have 1 built in, ?

Asked by dougiedougworld 8 years ago  |  last reply 8 years ago

Gravity Lamp Calculations

Http://www.core77.com/competitions/greenergadgets/projects/4306/ some people might recognize this little invention a while ago.  Well I recently wanted to make one after a freak snow storm rocked central pennsylvania (didn't have power for 2 days, it sucked balls).  But, after doing the math, his claims seem impossible.  Someone check the math for me: Facts of the Gravity lamp (with data in favor of the lamp_: output: 600 lumens weight falling: 50 pounds distance falling: 58 inches (in reality it's a bit shorter, but i'm just putting everything in favor) for ease of calculation and in favor of the lamp, assuming 100% efficiency. lasts for 4 hours calculations: 600 lumens = 7542 candellas = 7542000 mcd the highest efficient LEDs i could find output 120,000mcd at 20mA (0.02 amps) with a drop of 3.2 volts 7542000mcd/120000mcd = 63 LEDs 1 LED = 3.2 volts * 0.02 amps = 0.064 watts 63 LEDs = 4 watts 50 pounds = 22.68 kg on earth: the force of the weight is 22.68*9.8 = 222.264 newtons 58 inches = 1.47 meters 1 joule = 1 watt * 1 second = 1 newton * 1 meter 222.264 newtons * 1.47 meters = 326.73 joules 326.73 joules / 4 watts = 81 seconds, NOT 4 hours looking back at it, I think i messed up the calculations at earth's gravity, because that part is just totally wrong :P.  I'm not far enough into my physics class to know how to properly calculate that, could someone else?

Posted by guyfrom7up 9 years ago  |  last reply 9 years ago

What do I need to make a constant current driver for a 5w LED?

I have a Vollong 5w 350 lumen LED. I was told i have to use a constant current driver for it to work. I looked at some instructions on here of how to build your own, but it was for a 1w and he had 200mA of current. I am needing somewhere around 700mA and a voltage of 7v. Can anyone explain what parts i need to substitute to get this made? I'd like to just make one myself instead of waiting 3 weeks for one to come in. Any help would be appreciated. Thanks!

Asked by MattATC 7 years ago  |  last reply 3 years ago

LEDs : Require urgent HELP about LEDs. Answered

Could somebody please answer me that using an array of 135pcs of 5mm LEDs that produce 12000mcd each be better than using 3pcs of Cree MC-E for a motorcycle headlight. will the 5mm LEDs produce more light (lumens) than the MC-Es. If yes then will the distance of the beam of light produced by the 5mm LEDs be the same as the distance of the beam produced by the Cree MC-E?  By the distance of the beam I mean how much far can the beam produced by an array of LED light up the road. Please answer somebody answer me quickly I need urgent help. I will be very greatful to youll

Asked by Jayvis Vineet Gonsalves 9 years ago  |  last reply 8 years ago

Putting RGB LEDs in paper lanterns for live music performance visuals, need help deciding what route to take?

So I have some paper lanterns, 8" in diameter, and I ordered some RGB LEDs to put in them, gonna wire it to an arduino and then to a computer so I can control them from offstage. I'm realizing that I probably need more light power (lumens?) than 3-5 RGB LEDs in each lantern.. :( So should I get a strip of LEDs or something? What's gonna give me some fire power for not too much dough? Also any other suggestions are more than welcome.

Asked by prismspecs 6 years ago  |  last reply 6 years ago

Need Circuit Diagram for 5 Watt 12v LED Connect to 6v 5Ah Battery

Hai Friends, I have 5 pieces 5 watt led's. Led Specifications: Model - 5 watt, Forward voltage (VF) DC 9 - 12v, Forward current  (IF ) - 900MA, Output lumens  - 800 - 900LM, Color temperature -  6000 k, operate voltage - 9v to 12v DC I want to connect these Led to a 6v 5Ah Battery. (Used in emergency lamps.I want to replace the old tube light in the batteries and replace with these led's.) I need the circuit diagram for the project.With Low and high Brightness modes.Please help me. thanks in Advance to those people, who are going to help me completing this project....

Posted by jinto1729 3 years ago  |  last reply 3 years ago

how to power 9 10 watt leds from a automotive battery?

I am building a under water array using 9pcs  10 watt green leds, and will be powering from a automotive battery. the led data is. 10 watt green 900 lumens voltage dc 9-10.8  current 900mA integrated approach 3 and 3 My current build has them in parallel due to not wanting to lose all leds if one fails but will change this if its not possible. I am having issues finding  a step up dc to dc adjustable driver that will allow a output of 10.8 volts an a current of 8100mA . Anyone have ideals or a better solution. Thanks.

Asked by johnnytyler 2 years ago  |  last reply 2 years ago

How LEDs Work

Right, so i know that LEDs work when a electron meets a hole and drops into a lower energy state. This releases energy in the form of a photon.After a few experiments for college i can show that as current increases light output increases i'm assuming this is because more current = more electrons = more energy released = more photons = more light output. Correct?Another of the experiments i did was to investigate the heat around the led and the light out. It turns out that as the heat goes up, lumen output goes down. Now the question, why (in a physical sense) does this happen?Do the holes become less? why?Thanks ppl

Posted by drummer ian 11 years ago  |  last reply 11 years ago

Nanotech makes white LEDs 5x brighter than before with warmer light.

New research with nanocrystals has created a new LED that gets 300 lumens per watt. Even better, the light is a warm white and not the cold blue-tinted white that we all know.The crystals absorb some of the LED's blue output and emit their own red and green light. That combines with the remaining blue light to produce a soft white glow.Existing commercial white LEDs are also based on blue LEDs. But they use a phosphor coating that converts some blue light into a broad spectrum of yellow light. When mixed with remaining blue light the result is a harsh blue-hued white. Link

Posted by fungus amungus 10 years ago

Wiring 10w leds to 12 volts

OK, I have some 10 watt - appr. 900 lumen leds that I want to use for a video room.  I have low voltage wiring in the walls and have a 12 volt 96 watt dimmer that I plan to power with a deep cycle 12 volt battery.  The leds are 3.4 - 3.6 forward voltage and 350ma.  I want to use 3 of these on each side of the room and was just hoping to get away with wiring each side in series and then connecting both sides to the dimmer. Am I looking for trouble wiring them directly without any resistors?  I really don't want to get into resistors, etc. if possible. Thanks in advance for any thoughts and suggestions. 

Posted by jagmanjoe 8 years ago  |  last reply 5 years ago

Looking for a motor and some LED lighting

I basically want to build a rotating display stand; I need to find a motor which can move ~ 2-8 pounds at a speed of 1-12 RPM (preferably adjustable). I also want to find some LED lighting which I can embed in the base, which will have somewhere in the neighborhood of 1,500 - 2,500 lumens, without generating too much heat. I know there will be heat, of course. I just don't want to be at temperatures that would burn wood or melt PVC, as those two materials will be used a lot. Where's a good place to order these inexpensively? I'd like to build just one for now, but if it works out, I will be making several of these, possible a few dozen total. So bulk pricing would be a plus, but is not a critical issue.

Posted by karossii 3 years ago  |  last reply 3 years ago

Super Bright Light for Nighttime Video Capture

Introducing the ProdMod Night Vlogger 160!Michael from ProdMod designed a high powered version of his photo light using a Luxeon LED with heatsink - The following project is a neat way to make your own high powered video light to attach to your digital camera or camcorder. I called it the NightVlogger 160 after I read the term on this article of someone willing to use this type of light to allow him to take paparrazi style video at night. At 160 lumen it is very bright and fits in a slim AAA battery holder using only 3 batteries.Make your own or buy the kit.Check out the facts at ProdMod.Then use it to film your Halloween shennanigans and post them here!via: MAKE

Posted by scoochmaroo 10 years ago

Does an LED driver rated @ 6v -12v hold/keep a source voltage of 8.4v to 6v or just maintain it between 6v - 12v

I should preface my inquiry with an admission of possessing very limited electronics knowledge. but I am somewhat familiar with battery voltages & amps. I have several Luminus SST-50 & SST-90 LED emitters. I have found that to achieve the full lumen potential these emitters must be driven beyond Luninus's stated typical vf of 3.2 volts. I do not exceed 6vf. I am aware that current is a major factor in the performance of these lights, but when using 5-6amps or the max of 9amps (SST-90)I notice little difference in the brilliance of the light. However, when altering the vf from 3.2v or 4.5v to 6v the difference is amazing. When using 5 X NIMH batteries (= 6volts/4.5amps) with an SST-90 the lumens are high. When I use 4 X NIMH bat @ 4.8 volts/4.5amps, there is about a 25% reduction in light production. With my limited electronics info.I assumed the voltage was the key force here. Or is there something about the volt/current relationships that I need to know? My ? actually concerns the drivers that I have. They are rated @ 6v - 12 v. Do you know if a driver, with these specs, regulates/holds the vf @ 6 volts when the source voltage is greater than 6 volts or does it just maintain the voltage within the range of 6v - 12v. Using 2 X 4.2v LIon batteries, connected to the driver, gives an 8,4v the volt meter reading. Such a voltage will destroy the emitters. I expected a reading of 6vf (@ the driver leads). If you are able to answer my question, one I would be profoundly grateful, 2 please be as detailed/specific/simple as possible. Thank you very much cgc210

Asked by cgc210 6 years ago  |  last reply 6 years ago

using a thermoelectric cooler for High powered LEDs

Has anyone tried using a thermoelectric cooler, like this one http://www.allelectronics.com/cgi-bin/category.cgi?item=PJT-7to cool down a high powered LED star. I am considering mounting one on the back of a new Luxeon RebelI plan on ramping the current up to max (1 amp) on the led, and run the Thermoelectric cooler (TEC) as high as possible off a lead-acid battery. Strap a giant heat sink on it (maybe a fan too) plus thermal and silicone over the whole thing. It wouldn't be pretty, but it would be a neat experiment on how many lumens you could crank out of one of these things. Any inputs, suggestions, Ideas? Feel free to make an instructale on this if you want, I can't guarantee I will do it anytime soon.

Posted by John Culbertson 11 years ago  |  last reply 7 years ago

Looking for a 12V solution to prevent another 12V circuit to power on -- Reverse relay

Hello, I have 2 separate 12 volt lighting systems in the yard.  One is a low-voltage garden lighting that illuminates paths, trees, and a hot tub shelter. The other is a security lighting system, a 12V system that lights 6 each 900 lumen flood lights powered by solar panels and batteries. Other than shine a flood light from the landscape light system at the security system light sensor, is there a relay I can install that prevents the security lights from powering on until the landscape lights turn off?  I guess I am thinking of the redneck version of the relay that puts generators into play when the power goes out. I want my yard to be friendly while the landscaping lights are on, but we dont need a soccer pitch until the guests go home. Kind of like a rock concert.

Asked by SeanW65 2 years ago  |  last reply 2 years ago

DIY Outdoor Event Searchlight

In am interested in building an outdoor event searchlight or advertising spotlight that you might find at the opening of a Hollywood premier. Basically, an intense beam of light projecting miles into the sky to attract people to a location.  I searched Instructables and found some projects for stage spotlights but nothing like an outdoor searchlight. I did locate some complicated Carbon Arc and Xenon lamp projects but these involved a lot of expertise in electrical engineering! I am a novice but I am comfortable with basic "household' wiring. With that said, my thought was to try using 7 or 8 (maybe more) 55w car Xenon HID (6000k range) headlights as my light source. Xenon HID produce three times the light output as standard halogen headlamps (3000 lumens vs 1000 lumens) and require less energy. The "conversion kits" come with the igniter module and inverter ( ballasts) which reduces the amount of electrical wiring. At this point, the power source could be to use 110v household AC current and then, using a AC to DC converter, turn it into DC voltage and let the "conversion kit" components change it back to AC.  From what little I know, Xenon HID take about 25,000 volts to start a Xenon bulb and then 80-90 volts to keep it operating. During operation the AC ballast frequency is usually in the 250 to 450 Hz range. Each bulb draws around 6.5 amps at startup and then stabilizes at around 3.8 amps. Next, I would place the bulbs into the center of a Ellipsoidal Reflector to direct the light skyward. Basically, the 7-8 Xenon HID bulbs would be secured to a piece of sheet metal and then surrounded by a reflector so it would be like a VERY large headlight pointing into the sky. In one of the YouTube videos, the guy used a trashcan as the housing. I am not looking for something this large but similar in concept.  I located an Ellipsoidal Reflector on Ebay for about $55 and then I might just build a housing around it.  But would the reflector be enough to concentrate the light into a strong beam? Or, would I need to have some sort of lens to focus the light? If anybody has constructed something similar of if you have any pointers on what to do, please let me know.

Posted by leblanc9425 2 years ago  |  last reply 2 years ago

Wiring high power LEDs and need some direction.

Hello all, I am currently trying to design a product, we'll simply call it a light, that requires 6, maybe 7 extremely bright LEDs. I'd like to keep it running off a 3v battery. The LEDs I would like to use are made by Cree (XP-E2) or something similar. The specs can be found on this page:  http://www.cree.com/led-components-and-modules/products/xlamp/discrete-directional/~/media/Files/Cree/LED%20Components%20and%20Modules/XLamp/Data%20and%20Binning/XLampXPE2.pdf My question is, will I even be able  to fully power 6 of these things off 3V or even 6V(I'd rather keep it to 3V)? If so, how long can I expect the battery life to be? I've never had any experience with these high power LEDs before, but all of the other SMD LEDS only light to ~40 lumens. I'd really like to make this work, or find a similar alternative. Thanks in advance.

Asked by bodezia 5 years ago  |  last reply 5 years ago

Can the large amount of sodium acetate decrease the stability of the glow of TCPO?

Sir we had made the TCPO by ourselves and we used the dye DAPN(diaminp phenazine) instead of 9,10-bis(phenyethyl) anthracene and use the solvent ethyl acetate for this and procced as your procedure but we didnt't get the glow for minutes.It lasts only for seconds(i.e. 3-5).Is this due to the use of DAPN rather than the use of anthracene? We had made the DAPN with the mixture of OPDA(orthophenylene diamine) with Distilled water and the addition of the HRP(horse radish periooxidase). We had used the amount as: 15 ml of Ethyl Acetate 1gm of Sodium Acetate 3mg of DAPN 3ml of hydrogen Pero-oxide 800mg of TCPO Sir, we are the student of Nepal studying Biomedical Engineering and we are doing our final year project and we need your help in this, as our project is based in the che miluminescece method for the pregnency detector.Please,please sir help us sending your reply.We will be very thankful towards you if you will be kind to us.Eagerly waiting for your reply.?

Asked by 9 years ago  |  last reply 9 years ago

How do you convert a UHP lamp specifically for a DLP Viewsonic pj250 projector into an LED lamp? Answered

I have a DLP type Viewsonic PJ250 projector, it uses a UHP 120 W lamp, gives 1000 Lumen's, and 2000: 1 contrast. Our current technology doesn't seem to have made an actual LED version lamp for this or replacement LED for them yet, but one day someone will, is it you? Current lamp costs $200+  so developing this will help out people that need a lamp last more than 2000 hours. So is there someone that is up for the challenge of redoing or making a way to connect this and other projectors with LED technology in a relatively affordable manner? I have researched online and seen people do it for other types of projectors, like LCD, and understand the precise lighting in such a small area needed for my type of projector. I believe it is possible very soon to recreate a new lamp even if it takes a little rewiring and ingenuity. Thank you, I look forward to learning something new.

Asked by robadelic27 8 years ago  |  last reply 8 years ago

LED glow tubing question?

I am thinking of putting some glow tubing on the inside of my 14 foot jon boat, mainly for night fishing. It would also make it look really cool at night. The concept is simple, some of you may know - clear tubing from the hardware store, filled with water, with an LED in either end. This should light it up even if it is curved, right? I want to put long tubes running the length of the boat, on the inside groove of the side runners. That would mean 13+ feet of slightly curved glow tubing. I may have to end up splitting the glow sticks into smaller sections, but would like to see if I can do long single tubes. I'm concerned that the light will fade out in the middle considerably. I'm OK with it fading a little, but I don't want it to be noticeably bad. Will a narrower light beam help solve the problem? (found some 12 degree online) I will go for the narrowest beam and highest candlepower possible.  Am I on the right track? Got any advice?  Thanks a bunch

Asked by catman529 7 years ago  |  last reply 7 years ago

Fluorescent bulb questions ? Answered

Hello, Short question but sorry,  I cannot seem to shorten it; the actual question is in the last two lines . My friend's outside light stopped working; Earlier today I was asked to replace the two bulbs; they had stopped working and seemed slightly brown on the ceramic part. They are four pin fluorescents; I have not used these type before. I went to Screwfix and their catalogue showed two bulbs that looked identical to the original but one model said for electronic ballast only and one type said for magnetic ballast only; the shop staff did not know what a ballast was and could not advise me, when looking at the original, which type to buy. I went to Toolstation , no such distinction was made in their catalogue; I asked the guy about the ballast suitability; he did not know what a ballast was; I bought the one that seemed the closest in name. I have never has to think about ballast types before buying a bulb before; but after buying the bulbs I found a sticker on the lamp saying -electronic ballast. I stuck the first bulb in, it did not light. I put the bulb, instead, into the next socket; it lit and stayed lit. I put the remaining bulb in the first socket and both bulbs stopped working; whatever combination that I tried. The original bulb was an Osram Dulux D/E 26w/840 The  new bulb is a  sylvania lynx-de superia 26w 840  G24q-3 Technical Details Brand Sylvania Item Weight 9 g Product Dimensions 16.6 x 3.6 x 3.6 cm Item model number 25927 Part Number 0025927 Colour Cool White Shape Stick Maximum Compatible Wattage 26 watts Voltage 240 volts Specific Uses General purpose Batteries Included? No Type of Bulb Compact Fluorescent Light (CFL) Cap Type G24q EU Energy Efficiency Label A Luminous Flux 1800 lumen Wattage 26 watts Wattage 26 watts Bulb Features Low energy plug-in compact lamp Colour Temperature 4000 Kelvin Colour Rendering Index (CRI) 85 Average Life 10000 hours Average Life 15000 hours Bulb Length 167 millimetres Warm Up Time 30 seconds Lumen Maintenance Factor at the End of Life 95 I still do not know if it was the correct bulb or not but . . . Here are the questions:   Are some bulbs suitable for both types of ballast ? What happens if you put the wrong type in; does it just not work; or does it blow the bulb; or/and does it damage the lamp? Thank you

Asked by FriendOfHumanity 4 years ago  |  last reply 4 years ago