Anyone made their own LED lamp?

Two 60-watt equiv leds in parallel?

I just installed a 50 watt LED floodlight for a neighbour with bad eyes. The device had about a hundred LEDS in it. Painfully bright.

Google? I quick search pulled up a 2000 Watt LED bulb for under $30. What price are you looking for? What sort of bulb can you build for under $30?

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Rick

One approach is to buy incandescents, which are still available on the grey market. A proper 100W bulb is around 1690 lumens. (I still have around 200 of them from before 2012, but 1000bulbs.com is your friend.)

Cheers

Phil Hobbs

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ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

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hobbs at electrooptical dot net 
http://electrooptical.net

Was at Costco today. They had a 2000 lm work light for $30. Didn't look carefully, so don't know whether it's easy to disassemble reassemble in your application.

Back when 40W equivalent leds were $1 and 60W were > $10, I used to use a dual socket converter to use two 40W.

I have some pipes that I keep from freezing by shoving a 100 watt light bulb in next to them. I'm pretty sure the CFLs and LEDs won't save me any money in this application. Too bad I can't buy 100 watt incandescent bulbs anymore.

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Rick

you can get heat cable that self regulate to a few degrees above freezing just for that purpose, might save you a bit on electricity

-Lasse

I made a small one a couple years ago, using Cree XPEBWT-01-0000-00CC2 "1 Watt" LEDs. I did a massive search at Digi-Key back then and determined this one had the best Lumens/Watt at a reasonable price. My first one used an LM3404HV lighting current regulator chip and a transformer-rectifier power supply. I had 10 of the Cree LEDs in series, running at 300 mA. Did a GREAT job of lighting up a dark laundry-pantry area in our house.

So, then I built a 20 LED replacement for dual 48" fluorescent fixtures. One set of 20 of these LEDs fully replaces a pair of 48" fluorescents. See

I went with a commercial power supply for these. It is rather expensive, but small, very efficient, and I don't have to fiddle with it.

The heat sink is just PC board material, about 4 square inches per LED.

So, I'm pretty sure you could make any lamp you want. Do you really NEED

2000 lm? These replacements for DUAL 40 W fluorescents run about 2000 lm (on 21 W 120 V AC input power), and you'd better NOT look at them without a diffuser over the LEDs! You will be seeing spots for some time.

As for efficiency, these LEDs are 104 lm/W, which still seems to be nearly as good as it gets. Higher efficiency can be had at massively higher prices.

Jon

Neeeerp! Most of the house is already done with GE LED's, 10W=60W equivalent. ...Jim Thompson

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| James E.Thompson                                 |    mens     | 
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I love to cook with wine.     Sometimes I even put it in the food.

Pretty worthless for most cases. You have to have all the tape in contact with the pipe and you can't over wrap any tape. A major pain in the rear. I have some of wrapped with tape but I can't get it onto all the pipe. The parts that are under a cabinet are warmed more than enough by the light bulb which is far from expensive to operate. I think the last time I estimated it was only $10 a month to run a 100 watt light bulb 24 hours a day. That's only $30 for the whole season. The heat tapes cost that much to buy.

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Rick

Yoou can still buy them, they are labeled 'speciality' bulbs. A little more money though.

Cheers

We made a pulser thing... for CW I'd guess it's all about the thermal path and getting rid of the heat.

George H.

On Thu, 03 Mar 2016 17:17:29 -0700, Jim Thompson Gave us:

Making a superbright unit for the gov that temporarily blinds a person.

I bought some heater tape with a thermal switch in the end. Install and forget.

George H.

Wow, I know someone just like you... you have to know everything, be the smartest man in the room, so anything that isn't your idea must be wrong.

George H.

Sorry I should have just thrown that away...

BORING. Magnesium ribbon, or oldstyle wire-filled flash bulb. Done to death.

I don't know what the heck you are talking about. I have some of those tapes and after I got them I found they were very hard to use. Why is talking about that so offensive? Do you feel I am putting down Lasse or something? Maybe I should have started by saying, "Thanks for the suggestion"?

I guess I was dredging up my negative emotions about a very frustrating weekend I spent one time trying to rapidly get ready for a cold wave that was about to hit. I couldn't find a damn thing that would work other than to heat the various spaces.

I'm sorry if I came across as rude.

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Rick

If you are referring to LEDs with Imax=3 A i.e. "10 W", I very much doubt that they would produce more than 100 lm/W at Imax. Anyway, running those at Imax and the effective lifetime may drop to less than

10000 hours. The heat removal at Imax is also very hard.

However, running those at 1 A, you will get past 100 lm/W even with usable colour rendering. The effective lifetime can be quite high. To get 2000 lm, you would need six of those "10 W" LEDs in series driven from a 1 A constant current source. The heat removal is not so big problem.