### Powering LEDs?

What I am trying to do is built a LED board that beats to music.  I have found many way to make it beat to the music, but my problem is I don't understand how to power the LEDs.  I am new to building electronics, and I am still learning.  Anyways, what my hope to do is use build a board 46in long running one LED per inch.  This will be dived up into smaller sections to run different beats off my home theater system.  I am trying to run all of this using  4 TIP31c, and I understand how to use them, I just am not sure how to power this.  Thank you!

Question by Togroovy4u 6 years ago  |  last reply 6 years ago

### Powering LEDS with mains power.

What if you made a voltage divider with high-value  resistors, and then rectify the signal?  Is that dangerous?

Topic by flagrantfouler 8 years ago  |  last reply 8 years ago

### Powering LEDS with mains power.

The idea is to use a voltage divider with high value resistors and then rectify the signal.  Is this dangerous?

Topic by flagrantfouler 8 years ago  |  last reply 8 years ago

### Leds

New to site not sure this were to post this. Led's for ac powered model railroading, to replace incandescent bulbs.  Voltage to track varies from 5 to 17 volts AC.  Leds will light up, but what is it doing to them. They do not pop like a flash bulb at top voltage. I've rectified some to dc voltage for lights in cars, the variable voltage seems to power them. Ideally a circuit that put out a constant 3.2 DC volts, with a variable 5 to 17 volt AC input.  Or maybe would a constant 3.2 volt AC out would function? I found that with HO DCC control, a white led with a 1k resistor will function, have not ran them for more than few hours though. Prewired rectified leds go for around \$3.00  each, 5 passenger cars, 2 bulbs each, gets pricey with 4 sets of cars. Surly someone has gone through this.

Topic by 31cssinc 5 years ago  |  last reply 4 years ago

### LED project

I am looking to create  an array of LED's attached to switches. There will be 14 LED's in total. 3 green LED's attached to a single 2-way switch, 8 red LED's attached in pairs to 4 3-way switches, and 3 white LED's attached to 3 more 2-way switches (3 seperate 1 switch:1 LED set ups. Nothing wierd or fancy there). I'd like it all to run off a single power source, light powered would be best, but if that turns out to be too complicated I'll settle for battery powered. My questions are: What kind of power source will I need to use? How is the best way to wire it? and What sort of equipment will I need (resistors, capacitors, etc)?

Topic by T-Prime 7 years ago  |  last reply 7 years ago

### led powering question

I am building a garduino since planting season is coming near and this would be a great to start me seedlings off in. right now I have 3 banks of three red leds rated at 1.8v and in one of he instructible they said 7v was sufficient but i am connecting a 9v and can only power 2 leds and also I would like to go with an ac-dc converter but everyone i found has at least 800+ mA can someone point me toward a good power supply at the end I am looking at about 25 red and 8 blue LEDs

Topic by redwind 8 years ago  |  last reply 8 years ago

### LED power supply?

I need some insight on powering 2 separate circuits. Here's what I have so far...... Circuit #1.   80 3.3v  leds consuming 400MA. Circuit #2.   20 2.0v leds consuming 60MA. Now my power supply output is 15v - 600ma, will this power supply suffice wired parallel? I do have a 9v-1a power supply too that could power circuit #2 if need be. but for simplicity of things i would like to use one power supply.

Question by ARGMISTER 6 years ago  |  last reply 6 years ago

### LED Power consumption ?

I'm building a solar powered lighting for a farm, what will be the power consumption for a 10 white led.

Topic by yousaf65 9 years ago  |  last reply 9 years ago

### LED power indicator?

Just wondering how to to wire up a LED to show when a project is powered. Eg. push button switch doesn't show on/off.

Question by SWIRLYTHINGALERT! 9 years ago  |  last reply 3 years ago

### LED in parallel to power? Answered

I have a project and i am wondering if you can hook up a diode to the power source (hook it up in parallel to it) would you have to hook it to ground in some way??

Question by astroboy907 9 years ago  |  last reply 9 years ago

### LED Power supply?

I have approx 200 flashing LED circut boards that I want to make a twinkling display from. Each board has a single LED that flashes about every second, each board also has a single 3v cr2032 lithium battery powering it. What Id like to do is remove the battery on each one and wire them to a DC power supply that can be plugged into 120VAC. So I actually have two questions: Should I wire these in series? Or parallel? What size power supply would I need? Heres a link to a picture of what I have. http://www.rocketproduction.com/wirefree-leds.php Thanks (in advance) for all your help!

Question by McBeeRob 6 years ago  |  last reply 6 years ago

### magnet powered LED

Ok i remember seeing something, or maby its just a thought in the back of my head. but is there a way to make a led light up when you move a magnet by it or something like that?

Topic by yuckzee 10 years ago  |  last reply 10 years ago

### Power LED Help

I'm looking to make some home lighting with LEDs, but I'm not sure how to regulate the current properly. I've really only used resistors up until now for led projects. I have a couple ATX pc power supplies, and I've used it to power an ebay led with no problems. I just touched the led directly to the 3.3v line and ground and it lit up fine. What I'm wondering is, is does the psu automatically adjust the current to what you need? Or is there something else I would need to worry about? (I figured it would be okay to power something off the 3.3V line if they were 3.7V leds, say several P4s)

Topic by opliko 10 years ago  |  last reply 10 years ago

### Power for 12 LED? Answered

I want to make something and decorated with LED lighting for my girlfriend's birthday present. I will need to light up 12 LED, which has typical forward voltage around 3.5V, and I wonder what is minimum number of batteries (AA/AAA) I need to use and will still give a reasonable brightness please? Can it be less than 3 batteries? As it doesn't really make sense to have a lot of batteries in a small present. Thank you very much

Question by luckyvictor 8 years ago  |  last reply 8 years ago

### Powering an LED strip? Answered

Hi, I am looking to use a small LED strip on my bicycle. Something like the product below. I have no experience with LED strips, and am looking for a way to power them. I want something small & light to mount somewhere on my bike, and wondered what the best options would be? Would a 12V battery pack be suitable (see below). How long would this last roughly? Thanks! Dan LED: http://www.ebay.co.uk/itm/2x-6LED-Eagle-eye-Super-Bright-White-Flexible-Car-Daytime-Running-Light/151040285688?_trksid=p2047675.m2109&_trkparms=aid%3D555003%26algo%3DPW.CAT%26ao%3D2%26asc%3D29%26meid%3D1853554389978170290%26pid%3D100010%26prg%3D1013%26rk%3D2%26rkt%3D15%26sd%3D271286250637%26 Battery pack: http://www.ultraleds.co.uk/12v-1-25a-15w-mini-power-supply-ac-dc.html

Question by skatmandu2002 5 years ago  |  last reply 5 years ago

### Led powered by 9v

Hi all. I am new to this forum and need some help. I want to mount an led strip to the bottom of a roller skate. Everything I find already made up requires 12v. I need to keep the setup as small as possible for mounting reasons. How could I go about making a 12vdc led circuit work off a 9v battery or how could I wire up some led's on a flexible strip powered by a battery. I am thinking 9v because I can purchase a rechargeable set without draining the bank account each time. Any suggestions are welcomed. I have about 6" in length to mount the strip to. I would like multi color led but one solid color would also be fine. Thanks again for any suggestions.

Topic by rsfaze 11 years ago  |  last reply 11 years ago

### High Power LEDs

I have 3 10 watt LED emitters to sell (2.9 cm x 2.0 cm x 0.3 cm) Colour temperature is about 6000K I'll ship anywhere in Australia I don't have a good quality camera right now Send me a private message and I'll see what I can do

Topic by .Unknown. 6 years ago

### power IR LED ? Answered

How can I power 30 IR leds comes from TV remote by a 3.6volt cell phone battery. the LEDs are 1.5 volt.

Question by asifarifin 5 years ago  |  last reply 3 years ago

### LED powered party

So me and some friends a month ago got together and threw a party together last minute. Well it was more then just a hit, people turned around and begged us for more. So now that we have cred for this "epic" party which really was just random shit tossed together in a house in an hours time. So this time around we are going to go all out and spend our budget fully. But my job is to do his house like my room: I only have LEDs for lights. But the LEDs I used for my room I bought at radio shack and thus paid top dollar for them. Which was fine, for my room, but a house? I need bulk. Bulk LEDs, bulk resistors, bulk wire. But that's only half the problem, I was told my deadline was the 23rd. Well even with this short time frame I still need some good bulk dealers. Does anyone have any good links to places that sell LEDs in bulk? I'm looking to spend around 50 bucks or so on the lights. As I do this project though I will either make an inscrutable out of it or the very least a slide show!*

Topic by Vicious 10 years ago  |  last reply 10 years ago

### Power Supply and LEDs

Just wondering what i could do with my old computer power supply? THANKS.... Also...What bout LEDs ....what can i make with them??? THANKS

Topic by Shadown92 11 years ago  |  last reply 11 years ago

### Power 2 LED's

Basically I want to power these 2 LED's from mains power for an Instructable, i have no idea where to start, please describe in laymans terms, any help greatly appreciated cheers

Topic by abitdifferent 7 years ago  |  last reply 7 years ago

### SOLAR POWERED LED

I am trying to design a project for homeless people.  I need to attach an inexpensive solar panel to a bag.  The panel would somehow connect to a (cheap) battery, storing energy to power a waterproof LED for use in the dark.  Is this possible?  I have seen waterproof LEDs here.  But how about the solar power to battery to LED part?  I am electrically-challenged, so make this easy, okay?  Thanks a million.

Question by Laughing Whitefish 9 years ago  |  last reply 6 years ago

### power supply for LED's? Answered

I have a strip of LED's that have a warning that's says use only with a 12v class 2 power supply. Is this referring to an AC/DC transformer? Should I be able to run them straight from a 12v battery? If I am using a 12v battery is the class 2 circuitry still needed?

Question by MDheliMech 5 years ago  |  last reply 5 years ago

### Led Power Supply?

I am going mad over trying to figure out what power supply I need. I am making an arduino controlled aquarium fixture and plan on using 30x3w leds. From what I understand using resistors could cause fire and I don't want that of course. I like the look of laptop drivers like this one http://www.gapsupply.com/LED-Power-Supply-p/12v-dc-nwp-96w.htm but I cant figure out which one I need. I have seen all the instructables for this and everyone seems to tape 8 meanwell drivers together. I dont want a big bulky ugly mess like that just one power supply to do the job. The smaller and more compact the better. I will be running 2 rows of white on the outside and one row of red in the middle. 10x3w leds per row. each row individually dimmable via ir and tft. here is the led specs. Whites: http://www.ebay.com/itm/390908787444?_trksid=p2059210.m2749.l2649&ssPageName;=STRK%3AMEBIDX%3AIT Forward Voltage: 3.2-3.8V-700MA Luminous flux: 200-230LM Output power: 3w Light Color:  White 6000-6500K View angle: 120-140 LED support：Copper Life time:50000 hours Reds: http://www.ebay.com/itm/310834616296?_trksid=p2059210.m2749.l2649&var;=610229587957&ssPageName;=STRK%3AMEBIDX%3AIT DC Forward Voltage:2.2V~2.8V Forward Current: 600-700mA Output power: 3w Light Color:  White 6000-6500K View angle: 120-140 Any help and ideas is greatly appreciated. Thanks

Question by charles.terhune 4 years ago

### LED powering and switches

I am trying to build a small display box that has 2 LEDs (either 3mm or 5mm). One LED lights the displayed item from above, the other from below.  I plan to use only 1 LED at a time, so I presume I need an SPDT-Center off micro rocker switch.  I have a small model and it provides ample light with 2 CR2032 batteries, however, I'd like to be able to use an AC/DC adapter in place of the batteries. I need help figuring out what parts I need so I don't create anything dangerous. I am confused by the terminology used for the switch...how many amps/volts would I need? Am I correct that I would need a 6v adapter? Can the adapter be wired directly to a battery holder, or can it be SAFELY wired directly to the switch/LEDs? I want to order some stuff, but I don't know what I need! If anyone can provide this info, I would be grateful! Thank you.

Topic by craigo 7 years ago

### Flashing led? Answered

I know this may be basic but im still pretty new to this all. I have 4 leds that have to flash together. Would a 555 timer work? could someone link me to a diagram. I was wondering if i could make the speed change able, super fast to slow.

Question by Aaamazzara 7 years ago  |  last reply 7 years ago

### led display board?

I would like to create an electronies board with different displays

Question by richard2020 9 years ago  |  last reply 9 years ago

### LED Capacitor Issue?

Ok, so i have a non alterable power source of about .75 volts. I need it to power a 1.8v red led. I don't want to use the joule thief to accomplish this....so...Can I hook up a capacitor to store energy, then transfer it to the led? or how can i get the led to fully illuminate? THANKS!!

Topic by Joe426 11 years ago  |  last reply 11 years ago

### longboard led project?

I have a very basic knowledge of LED's and such, i know how to wire them, but i still get a bit confused as to what power supply and stuff to use. Anyways, i'm wanting to do a project similar to this instructable "https://www.instructables.com/id/DIY-skateboard-longboard-riser-lights-angled-riser/?ALLSTEPS" except that i want to have about maybe 10-12 led's on the bottom of the longboard pointing down (flush against the bottom) kinda like cars with the neon lights underneath...so my question is, what do you guys suggest i use as a power supply and where should i put it on the longboard so that it doesn't get destroyed while riding?, can i just parallel all of the led's or is this unwise? also, do i use 1 resister for the whole thing? or in between every parallel? like i said, obviously i'm not very knowledgeable about led's yet...i'm getting there though lol.

Question by miqt 10 years ago  |  last reply 8 years ago

### 100 watt LEDs

Hi there I am wanting to drive 5 100 watt Cool white LEDs at half power total of 250 watts. Each LED spec is 32-34 volts DC @ 3.5 amps. Ideally I would like to drive from one power supply. or 2 at most, any advice would be welcome. please email me at tn21@live.co.uk

Topic by JohnT10 4 years ago  |  last reply 4 years ago

### Help with LEDs

Hi, I'm new to the whole electronics thing, and i decided to try and make a sign for my brother for christmas. I was planning to back light it with 4 rows of 3 leds in each row, each row being a different color. I was planning to power it with a plug in the wall power supply that outputs 9v DC 450 mA. Also i was planning to have a switch for each row, and a potentiometer to control all the leds. The leds have about a 2.8 forward voltage @ 20mA. I was wondering if it would be possible to power the leds with this power supply, and if so, what the circuit diagram would look like with all the resistors, leds, etc.. (whatever else i need). Thanks

Topic by OpenSpace 8 years ago  |  last reply 8 years ago

### how to power a 30w high power led? Answered

I order a 30w led from ebay but i dont know how to power it can i use just a 16v 2a power adapter or hove i to buy a led driver here is the led:             http://cgi.ebay.com/30W-White-High-Power-2100LM-LED-Light-Lamp-Bulb-A_W0QQitemZ220708010099QQcategoryZ163866QQcmdZViewItemQQ_trksidZp4340.m263QQ_trkparmsZalgo%3DSIC%26its%3DI%252BC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%26otn%3D10%26pmod%3D220693236934%26ps%3D63%26clkid%3D5621333683761900258

Question by Andrew_48 8 years ago  |  last reply 8 years ago

### Battery powered arduino + high power leds?

I'm desperately trying to design an arduino circuit that can power each color of a high power cree MC-E color RGB led. What is the smallest dimension rechargeable battery I can use to accomplish this and have it run for a few hours? I'm desperate!

Question by SpiffyChee 8 years ago  |  last reply 8 years ago

### how to power a 30w high power led? Answered

i am making a diy homemade projector and i want to know how to power a 30w led without a driver becouse the driver cost 30\$ and i want to make the projector as cheap as posible so if anyone know a way to power a 30w led without a driver please help me the led ......http://cgi.ebay.com/30W-White-High-Power-2100LM-LED-Light-Lamp-Bulb-A_W0QQitemZ220708010099QQcategoryZ163866QQcmdZViewItemQQ_trksidZp4340.m263QQ_trkparmsZalgo%3DSIC%26its%3DI%252BC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%26otn%3D10%26pmod%3D220693236934%26ps%3D63%26clkid%3D5621333683761900258

Question by Andrew_48 8 years ago  |  last reply 8 years ago

### LED bracelet inlay

This is my first post so please excuse if I am in the wrong place :( I have a boot bracelet with a leather back and ornate bling glued to the leather and sewn at the edges. I want to add small LED strip lights, weather proof, cutable every 3 lights, double-sided adhesive to the center (between leather and ornate mesh side. I want to be able to turn it  on and off.  I figure 6 mini strip lights should be more than enough.  Here are the lights I have: Features: Superbright 3528 SMD LEDs with high intensity and reliability. 5 Metre strip with 600 LEDs Self-adhesive back with double side adhesive tape. Maintenance free, easy installation Long life of 50,000 hours Flexible strip which can easily be curved around bends. UUltra-bright but running at low temperature Viewing Angle : 120° Input volts: DC 12V This Cool White strip light has 600pcs Double Density,SMD 3528 LEDs The Strip is Customizable for any length you want, Cuttable every 3 LED's without damaging the rest strips, flexible and can be bent at any angle, Works with a 12 Volt Power supply Low power consumption, Eco Friendly, High Quality, high intensity and reliability, High Quality Cool White, Double Density 600 LED's, 3528 SMD 5M/16.4 ft, high intensity and reliability, Long lifespan,   Hopefully that helps.  What I need is a battery source that can be added to the inside of the bracelet that will light it up and allow me to turn off and on (push on/off is better than switch). The source would have to be in something waterproof like a latex substance and can only take up a minimal amount of space 1.5 - 2".  Obviously the batteries would have to lay flat (flat coin-like batteries?) Is there ANYONE out there who can give me ideas?   Thank you!!!

Topic by harley0805 4 years ago  |  last reply 4 years ago

### LED's with separate power source? Answered

Can I have a circuit which runs from a power supply, this circuit has LED's in it, could I make it so that the LED's are still in this circuit but, they run from a separate power supply to the rest of the circuit? If so, how?

Question by henryplumb 8 years ago  |  last reply 8 years ago

### Another LED power question? Answered

I bought some LED modules with the intention of using them to replace florescent tubes in some fixtures. But I am now getting a bit confused about the power requirements because the numbers don't seem to add up. These are like the ones I bought. http://www.ebay.com/itm/221546290709?_trksid=p2059210.m2749.l2649&ssPageName;=STRK%3AMEBIDX%3AIT In the details description it says that each led is .25 watts and with 5 LED's per unit that makes the power requirements for each one at 1.25 watts. There are 20 units in a strip or module so that would mean that each module would require 25 watts.  If the LED's are ,25 watts then that makes sense since there are 100 LED's per module.  Now the thing is when I put power to them they are requiring a lots less.  With only a little AC adapter with an out put of 12 v and 2 amps or 24 watts I am able to power SIX of the modules. The power adapter does get warm after a few minutes but if I drop a module and go with 5 it is just fine. So if I go according to what they are actually using the power draw appears to be no more than 5 watts per module. Did they miscalculate? Or am I wrong in my simple math? I tried several different adapters and get the same results. A simple wall wart of 900MA can power 3 but overheats at 4.  How is it that they are figuring these at 25 watts when real life usage is saying its more like 5 watts? Its the 5 watt figure that would be more reasonable to me anyway.  I am guessing that it will take 8 modules to replace one dual tube 80 watt florescent.  If they are 25 watts each I am loosing on the power consumption because that would be 200 watts as opposed to 80. At 5 watts I am doing a lot better coming in at about 40 so that gives me an almost 50% power savings.  If I am correct in my estimates then a simple 30 or 40 watt power inverter like this would work perfectly. http://www.ebay.com/itm/AC-DC-12V-Transformer-Power-Supply-Adapter-LED-Driver-IP67-Waterproof-10W-200W/271569039906?_trksid=p5713.c100284.m3505&_trkparms=aid%3D555012%26algo%3DPW.MBE%26ao%3D4%26asc%3D29396%26meid%3D624e74e14a1848afb36d865d8590fc01%26pid%3D100284%26rk%3D3%26rkt%3D18%26mehot%3Dpp%26sd%3D221682389057 Any ideas as to why there is such a discrepancy in these numbers?

Question by Vyger 4 years ago  |  last reply 4 years ago

### LED power suppy help?

I am plan to run 4 leds in a seires parallel configuration. The leds have a forward voltage of 5.2 and run at 350 ma. Would it draw more power if I had a higher input voltage or would it still draw the same amout. I am trying to decide between lithium ion batteries and NMh.

Question by jack.h 10 years ago  |  last reply 10 years ago

### Wiring high powered leds.

How can I wire 60 2.5v ,350mA and 20 3.5v ,350mA leds. The 2 different leds can have seperate power supplies? Trying to build a grow light for indoor vegatables. Thanks for any help

Question by realkoolkat 9 years ago  |  last reply 9 years ago

### LED power consumption question. Answered

I need to power 62 LEDs in series. Does this mean I also need 62 1K resistors? And if I do, does that mean I need a 248V power supply?! Isn't each LED a 2V power consumption as well as each resistor? That math doesn't seem to add up at all, any help (and lessons in powering LEDs) is greatly appreciated. Thank you for the help!

Question by Schmidtn 9 years ago  |  last reply 3 years ago

### Power LED from RF? Answered

I have a maybe somewhat unusual question.There is a super simple circuit that enables an LED to be powered by ringing mobile phone. Can be found at http://www.creative-science.org.uk/mobile_LED_simple.html What I would like to do is to power LED but from a distance, preferably Radio Stations of (if possible) power lines. LED does not have to be constantly on or bright, it can "blink". I was looking at Joule Thief and combining it with capacitor ... The point is that there should be no battery. Is such a thing possible?

Question by nccwarp9 7 years ago  |  last reply 2 years ago

### led and resistorsa

With L.E.D's, are there any specific resistors i should use or would a 150ohm one be find and not give the resistor to much power and die?>

Topic by craig3 11 years ago  |  last reply 11 years ago

### Power driver LED faucet? Answered

Dear All Please could  you help me to know : how the  led faucet can generation power it self for driver led (please see photo) .I bought this device for open see inside (on Ebay) but still not yet arrived. Many thank you

Question by lam 4 years ago  |  last reply 4 years ago

### Common power rgb leds

Hello, I followed a great instructable here to make rgb led bars. It uses the ledwiz controller. I wanted to shift it over to an arduino controlling the thing. My main problem is that the leds I have is that they have one power lead, and 3 grounds to control the color. how would I get that to work with an arduino? Thanks ~penguins

Topic by penguins 10 years ago  |  last reply 8 years ago

### Battery Powered LED Strip

Hi, I have one 6V Alkaline Battery (or two 3V Coin cell battery) that i am using to light a fairy LED strip (see here). I'd like to know for how long the battery will last me for. Can you please direct me what parameters I need to collect for the battery (or the LEDs) and what equations i will be using to determine the operating time of the battery. Thank you for your support in advance, Regards,

Topic by Greensal 4 years ago  |  last reply 3 years ago

### LED Power supply question

I've got an idea to build a LED light strip for some decorative lighting under a couple of shelves, but it's been more than a few years since I've used my GCSE-level electronics knowledge and I could do with a bit of advice regarding PSUs and parallel connections. I'm thinking of using  two banks of 10 of these LED packages powered by a wall-wart type 12v PSU.  If I wired the individual banks in parallel would I be right in thinking that that would be a current draw of 200mA per bank since each LED has a 20mA requirement, and if both banks were connected to the PSU in parallel I'd need a PSU capable of supplying at least 400ma?

Topic by megahurts 8 years ago  |  last reply 8 years ago

### power single LEDs with USB?

I'm wanting to use some single 0603 LEDs here and there for a display.  I want each light to have its own power plug.  I'm figuring usb cables are a good way to do this (since I can power them by plugging into a hub, and retractable usb cables are cheap and handy).  If anybody has a better solution, I'm open to ideas. My question is whether there's some way to use a single resistor with the hub, instead of needing to add a resistor to each usb cable?  I'm assuming no, but figured it doesn't hurt to ask. Also, do I need different resistors depending on if it's usb, usb 2, or usb 3 hub/cables? And finally, since I'm getting my 0603 LEDs from some pre-wired Christmas light strands (mostly white, but a few colored), I don't have exact specs.  Is there a general standard that I should use for calculating which resistor to use?  3volts and 20mA sound good?

Topic by aliasjanedoe 5 years ago  |  last reply 5 years ago

### USB powered LED with Program?

How would i make it so theres a program to turn a led on and off via usb, i already stripped the usb cable to get red, black, white, and green wires, i know vb6, so i can write it in there. Help very much appreciated, been using google, and cant find it. EDIT: i dont have pic micro controller.

Question by MrCircuitBoy 8 years ago  |  last reply 8 years ago

### How long with this power a led

I have an idea for a nightlight for kids or even adults in the hallway or something.  But I am running into a problem.  The main housing for this light is going to be pretty small.  I was first planing on running this off a household electrical plug and that would work best.  But I would not know quite how to step down the power from the wall to only run 2-3 led lights.  I am sure I could get some sort of small circuit board that would drop the current.  However because of the small housing I doubt I could fit that in there.  I know I am not giving a whole lot of details but I do not want to give away my idea quite yet.  What I am wondering is how long would say 1 AA battery run 3 LED lights?  I am thinking this idea is not going to work out because people are not going to want to have to replace there battery every week or even more.  So if anyone has some input on this idea then please let me know.  The housing I think I would have to work with would be something like a pipe that is maybe 1 inch across the opening by about 2 -3 inches long.  So nut much room to work with at all. I await your replies.

Topic by jcaresheets 6 years ago  |  last reply 6 years ago

### Powering LEDs electrical question

Quick question . I have a 400ma power supply does that mean I could only wire 20 LEDS that are rated at 20ma?

Topic by Mr. TiKi 11 years ago  |  last reply 11 years ago