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 3 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 9 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


(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 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 3 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


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 8 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


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 10 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 7 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


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 9 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 10 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 1 year ago


SAD sunrise clock, led bulb mod?

I suffer with SAD and a sunrise clock helps a lot getting up in the mornings and winding down at night. I have one similar to this It uses ses 14 bulbs, currently using halogen 42W but these don't last long and I managed to blow one closing a drawer! So, I'm looking for a way to use 10 to 20W leds  but obviously, given its UK mains voltage that does the timed dimming, finding a suitable LED driver is difficult. There are a few out there but I've no idea which ones will work as it need it to. Also, the only commercially available dimmable led bulbs are e27 fit only, very expensive and only 12W, around 400 lumens. I need at least 600. Also the more the better. Looking to use 6400K or higher colour, as the higher temp colours are proven to be better for SAD. I can make electronic circuits and have hacked together/repaired plenty of stuff. I would rather build something than buy as I don't have £££ to spend! Does anybody have any ideas to help me get started? I'm also looking to replace my SAD bulbs, currently 85W cfls with LEDS as well.

Posted by kristyon 6 years ago


Brighter headlights?

Hey all! I drive a 1984 BMW 318i (that's the E30) with the standard H1 bulbs for the low and high beams (4 x H1 in total). I want better visibility at night and have been looking at options. Can anyone help with the following: 1. do i have to use high wattage bulbs to see a significant difference or would "upto 90% more light" 55W osram bulbs help? I would hate to spend the money on the 55W osrams only to end up with 5 extra lumens. 2. am i correct in saying that ALL xenon bulbs require the whole ballast and starter setup like fluorescents? are there some that don't? 3. Is there anyone who has used a high wattage bulb? what are your experiences? is the shorter life worth it? where on the continuum of wattage VS lifespan would you recommend? Right now I'm leaning towards the high wattage option, something like 80-100W. MY local hardware doesn't stock these and I doubt my local auto-electrical supplier would either. I'm thinking I may have to do some digging, maybe 4x4 accessory stores would have them since they are technically only meant for offroad use. K thanks, your help is much appreciated, I'll try to post an 'ible of old VS new and the installation procedure once I decide on the bulbs.

Posted by Baronrc 6 years ago


Fade LED on/off when powen on/off with strong LED in miniature space

I want to make a "magic" staff which will power on a strong (>100 lumen) LED under a crystal in the top of the staff. There will be a hidden switch somewhere and I want the LED to power up/down in approximately 1-2 seconds. The power source has to be relatively small batteries but big enough to power the LED for up to 30 minutes. I believe this can be done simply with just a capacitor and a resistor connected to the LED but since I'm a complete beginner, I'd like some advice. 1) How to connect parts together.  2) What parts to choose? I can calculate the timing from t = RC (or is it root of RC?) but there are soooo many to choose from. Probably the LED needs to be fully powered at 3 or 6V. Probably the resistor therefore needs to be 100-500 ohms? Probably the capacitor needs to be approx 2 - 20 mF? But it would be so much simpler if someone says: "Take these components - that will work". I guess choosing the batteries will be crucial for both size, voltage and current conciderations. But please note that I want the LED to be as strong as possible - flash light strength.  3) Is it possible to have a faster power down than power up (0,5 s rather than 2 s) without overcomplicating things (and crowding the space provided). The space is probably no more than an inch diameter (2-3 cm) cylindrical hole for a maximum of 3-4 inches (7-10 cm) length.  All help appreciated! 

Posted by The Mad mathematician 4 years ago


Indoor LED plant lights

I am new to posting in the forums, and actually am not even sure if this is being posted in the right area. My name is Ryan, and I need some help. I have been growing spices/herbs for my own recipes for a couple years, and have always used artificial lights. I use a whole wack of those spiral florescent lights (The 23watt ones to replace a 100watt light bulb), and it works alright. I now want to create a panel of LED's so that I can increase my lumen count, and therefore increase the rate of growth. I need help with how to use resistors to get the power to what a 50 LED panel would need. LED: wattage: 1 watt Forward Voltage : 2.1V~2.3V Forward Current: 300mA. ATX Power Supply: Wattage: 250 Normal 120 volt Canadian power I want to make a panel that has 50 1watt LED's in it, power it from a modified 250watt ATX power supply, and if possible, power more than one from a single PSU (Power Supply Unit) (Something like a quick connector setup, have all resistors panel side, and have cords running to the PSU where it uses quick connectors) I want to use the PSU because I have three at my disposal. I was thinking that it would only need 50 watts or something, and I could wire it in series, however I don't know what resistors to use, or where to use them, to make the power work for the LED's. I can wire thing together, solder, and have a basic understanding of circuitry (Like power flows this direction, and this will do that...... don't know numbers)

Posted by MaXoR 9 years ago


Gravity Lamp, the LED lamp powered by gravity

A Virginia Tech student designed an LED lamp that is powered by gravity. It is called the Gravia, and it took second place at the Greener Gadgets competition in NYC. Gravity as a renewable energy source? Amazing!From http://pesn.com/2008/02/19/9500471_Gravity_Lamp/Concept illustrations of Gravia depict an acrylic column a little over four feet high. The entire column glows when activated. The electricity is generated by the slow fall of a mass that spins a rotor. The resulting energy powers 10 high-output LEDs that fire into the acrylic lens, creating a diffuse light. The operation is silent and the housing is elegant and cord free – completely independent of electrical infrastructure.The light output will be 600-800 lumens – roughly equal to a 40 watt incandescent bulb. Each drop of the gravity mechanism runs the light over a period of four hours.To "turn on" the lamp, the user moves weights from the bottom to the top of the lamp. An hour-glass like mechanism is turned over and the weights are placed in the mass sled near the top of the lamp. The sled begins its gently glide back down and, within a few seconds, the LEDs come on and light the lamp, Moulton said. “It’s more complicated than flipping a switch but can be an acceptable, even enjoyable routine, like winding a beautiful clock or making good coffee,” he said.Moulton estimates that Gravia’s mechanisms will last more than 200 years, if used eight hours a day, 365 days a year.The winner of the Greener Gadgets competition was the Enerjar.

Posted by Brennn10 10 years ago


10 Watt LED Circuit

I am a software developer by trade and have little or no experience regarding LED and/or electronic designs. I am hoping someone here can help with a project I am working on using high brightness LEDs. I have studied several 'instructables' and specifically dan's "Circuits for using High Power LED's." My project consists of a few high brightness LEDs that will be placed in a high ceiling room with the brightness controlled by a microcontroller based on the light in the room (time of day, sun in window, etc). The microcontroller will use photocells to determine the brightness in the room and then adjust the LED using PWM pins. The LED is 10 watt and approximately 450 lumens. Attached is a circuit I drew as a starting point and would like help in determining if it will work, I am close or does it need to be trashed. I am not sure what the value for the resistor should be. Below are some calculations but not sure if I am on the right track or not. No need to be kind, I am more interested in getting it right and not losing any 'magic puffs of smoke' from any of the components. Here are the specs: LED IF: 1.6 A Peak Forward Current: 1.7 A Forward Voltage: 8 V LM350 (heavy duty version of LM317 IO_MAX: 4.5 A 1.2 - 25 V adjustable regulator BC337-40 Collection Current - Continuous: 800 mA dc Total Device Dissipation: 625 mW Resistor: 5W or 10W Voltage Amp Ohms Watt 8 1.60 5.0 12.8 8 0.80 10.0 10.0 8 1.10 7.5 8.5 Note: LED and components will have adequate heat sinks.

Posted by desnotes 9 years ago


Reefer meets High Power LEDs (looking for help)

Well this is my second post and I am a bit more learned in the ways of LED circuits from many of your posts.Objective: Create a high light output LED array that will peak at around 16,000K for growing coral for reef aquariums.Primary strategy: connect 10 or more Luxeon III stars in seriesPreferred requirements: Energy efficient, Low Heat emittance, Needs to peak out at the appropriate spectrum for the coral ( I have that covered just by changing the ratio of cool whites to royal blue Luxeon III's)At the moment I a just going for a simple on/off, later i would like to employ a form of automated dimming so that it fades on and off so there is not such a sharp on off with the LED's. So far I have a circuit that i plan on modeling my LED array after since it was readily available for me to dissect. The following is an LED array. I know that there is a diode rectifier bridge built in there and a smoothing capasitor but there are to components i do not recognize they are connected at the positive and negative ends of the circuit. One is the Yellow (doohickey with part # 684j 250) component attached to the positive lead and the other is a clear (fuse/resistor hybrid) component next to the resistor on the board.https://www.instructables.com/files/deriv/FGX/D7E2/FBQ33XYA/FGXD7E2FBQ33XYA.MEDIUM.jpghttps://www.instructables.com/files/deriv/FGX/D7E2/FBQ33XYA/FGXD7E2FBQ33XYA.MEDIUM.jpgI was able to draw the circuit and it seems pretty straight forward but I just need to know if I will be able to spec the appropriate components to operate 10 leds in series (Each LED operates with a Vf=3.9 V and I= 1000mA ) they will need a supply of more then 40V DC.Any help or dialogue I can get the more the better and the more I will learnIn addition I looked at Dan's high power constant current but not sure how well it would operate under the conditions that I have specifiedPrimary LED's in use for the Reef light: (note all are stars)LED part # Color Type Vf Amps LuxLXHL-LW3C cool white Lambertian 3.9 1000mA 80lumensLXHL-LR3C Royal blue Lambertian 3.9 1000mA 445mWLumensLXHL-MW1D cool white " " 3.42 350 mA 45 LumensLXHL-MRRD Royal Blue "" "" 3.42 350 mA 220 mWLumensThere was little to no difference between the 700 mA series and the 1000mA series so I did not list themI look forward to all your helpTom

Posted by Aquatope 10 years ago


Turning one USB port to two ports

(If this is in the wrong forum, please excuse me and let me know where I could put this.) Hello all, I'm in the process of getting my electronics together for doing bikepacking and could use a hint or two on how to resolve this.  Looks like I'm going to have a number of USB powered items that I will be rolling with.  I'm wanting to roll with a small solar panel too to help keep things powered up.  What I have is; - Nexus 7 pad - Phone (not sure yet what that will be) - Cygolite (360 lumens) - Cygolite Hotshot - Various batteries, Goalzero Switch, and two of these sticks - There maybe other items I either would need in the future or I've yet to list.  So one or two other units for the future. What I'm hoping I'll be able to do is roll with charging these pieces either with my solar panel, or when I stop at either a campgrounds or stop at a eating establishment.  When I do stop at a eating establishment, I'm hoping I could get things charged up as quick as possible.  So I don't want to waste time on a low powered USB port when my item would have taken a high powered USB port.  I assume that would a port that is 5W at 2amps, yes? So what I was thinking was, I know the AC adapter for the Nexus 7 has a nice high powered USB port.  So that would be one port.  I'm thinking of buying another cause they are pretty lite and compact.  So I would have two nice ports from AC.  (Now comes the more clueless part of me!)  So if I'm using some kind of splitter and splitting these two ports, it would seem that the amps get split in half........right?  Is there a way to avoid this and get something small and compact that would offer me 4 high-powered ports? Also it looks like the best way to go when I'm on the road is charge up the batteries listed above with the solar panel.  Then harvest what ever I can by the end of the night. Thanks for reading this and I'm open to any and all comments.  If there's someone blogging about this that knows alot more than I do, please do share!

Posted by User1 3 years ago


GID Vials, Tritium, TRASERS, Powders and Chemicals GLOW IN THE DARK!

TRITIUM! So I get a lot of questions from my post and instructables. Tritium Vials are Radioactive Hydrogen H3, also known as hydrogen-3 is a radioactive isotope of hydrogen. It is contained in small glass vials coated in colored phosphor then encased in glass or sealed plastics. These are commonly seen in Gun Sights, Watches (TRASERS) and some Emergency Exit Signs. http://en.wikipedia.org/wiki/Tritium_illumination Small amounts are legal and for approved uses. Read the NRC guides Typically the Trit vials are small, expensive and dim. The latest GID (Glow in the Dark) Chemsticks, LED's and GID Powders or paints seems much more effective and usable. * Cyalume, as used in a lightsticks, emits light by chemiluminescence of a fluorescent dye (also called fluorescor) activated by cyalume reacting with hydrogen peroxide in the presence of a catalyst, such as sodium salicylate. It is the most efficient chemiluminescent reaction known. up to 15% quantum efficiency. http://en.wikipedia.org/wiki/Chemiluminescence New LED low power requirements and high Lumen or light output have provided many solutions that are low cost, high power and longer lasting. GID Paint or Powders are "charged" with light or daylight sources as with your traditional kids toys or stickers. New products are brighter, glow longer and are now waterproof, have many colors and applications. http://www.4physics.com/catalog/GIDinfo.php Also this is occasionally confused with the chemical illumination. However these paints powders and materials use common phosphorescent materials include zinc sulfide and strontium aluminate. Use of zinc sulfide for safety related products dates back to the 1930s. However, the development of strontium oxide aluminate, with a luminance approximately 10 times greater than zinc sulfide, has relegated most zinc sulfide based products to the novelty category. Strontium oxide aluminate based pigments are now used in exit signs, pathway marking, and other safety related signage. http://en.wikipedia.org/wiki/Phosphorescence Hope this helps! 01/2011 - Update Source for Materials http://www.darkniteglow.com/glow-shop/ ERCK www.Candlepowerforums.com Additional Tritium Resources * U.S. NRC: http://www.nrc.gov/reactors/operating/ops-experience/grndwtr-contam-tritium.html * U.S. EPA: http://www.epa.gov/radiation/radionuclides/tritium.htm * U.S. DOE (Argonne National Lab): http://www.ead.anl.gov/pub/doc/tritium.pdf * California EPA: http://www.oehha.ca.gov/water/phg/allphgs.html * University of Idaho: http://www.physics.isu.edu/radinf/tritium.htm

Posted by erckgillis 7 years ago


Reefing it with LED's (help needed)

Well this is my second post and I am a bit more learned in the ways of LED circuits from many of your posts. Objective: Create a high light output LED array that will peak at around 16,000K for growing coral for reef aquariums.Primary strategy: connect 10 or more Luxeon III stars in seriesPreferred requirements: Energy efficient, Low Heat emittance, Needs to peak out at the appropriate spectrum for the coral ( I have that covered just by changing the ratio of cool whites to royal blue Luxeon III's)At the moment I a just going for a simple on/off, later i would like to employ a form of automated dimming so that it fades on and off so there is not such a sharp on off with the LED's. So far I have a circuit that i plan on modeling my LED array after since it was readily available for me to dissect. The following is an LED array. I know that there is a diode rectifier bridge built in there and a smoothing capasitor but there are to components i do not recognize they are connected at the positive and negative ends of the circuit. One is the Yellow (doohickey with part # 684j 250) component attached to the positive lead and the other is a clear (fuse/resistor hybrid) component next to the resistor on the board.https://www.instructables.com/files/deriv/FGX/D7E2/FBQ33XYA/FGXD7E2FBQ33XYA.MEDIUM.jpghttps://www.instructables.com/files/deriv/FGX/D7E2/FBQ33XYA/FGXD7E2FBQ33XYA.MEDIUM.jpgI was able to draw the circuit and it seems pretty straight forward but I just need to know if I will be able to spec the appropriate components to operate 10 leds in series (Each LED operates with a Vf=3.9 V and I= 1000mA ) they will need a supply of more then 40V DC.Any help or dialogue I can get the more the better and the more I will learn In addition I looked at Dan's high power constant current but not sure how well it would operate under the conditions that I have specifiedPrimary LED's in use for the Reef light: (note all are stars)LED part # Color Type Vf Amps Lux LXHL-LW3C cool white Lambertian 3.9 1000mA 80lumensLXHL-LR3C Royal blue Lambertian 3.9 1000mA 445mWLumensLXHL-MW1D cool white " " 3.42 350 mA 45 LumensLXHL-MRRD Royal Blue "" "" 3.42 350 mA 220 mWLumensThere was little to no difference between the 700 mA series and the 1000mA series so I did not list themI look forward to all your helpTom

Posted by Aquatope 10 years ago


The Monthly Challenge: Audio Hacks

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Posted by randofo 6 years ago