Quote Originally Posted by Weezard
Howzit, DH?

I just had a stoner thought.
Got a pile of peltier devices that I intended to use as active heatsinks.
[FONT=Book Antiqua][SIZE=4]Until I found out how much current they draw. Ouch!
I recently asked you about 10w vs 15w LEDs from LedEngin's, and in your response you mentioned the Flea-bay heatsink dealer (I had already stumbled upon him). That led me to think about various other ways to cool an LED light. I had successfully used pelitier devices before to cool LNAs (low noise amplifiers) used in satellite communication dishes I had installed in the middle east. The problem that I found was for every watt of heat you wanted to get rid of it took a watt of electrical power to accomplish it. A 1 kw light required 1 kw worth of peletier to cool....not real economical.

And DH, has it right about street lights, they are doing it now. I believe that Cree has a deal with a Chinese city to deliever street lights. They should be able to copy the technology and sell it back to us for less! Can't wait!

Hey DP, nice to see you following along and chimeing in!
oldmac Reviewed by oldmac on . Calling out to Weezard for LED advice My friend, I've read your stuff here and at Steve F.'s site. I want to build a dedicated flowering lamp using Ledengin 15 watters. (4 reds, 1 blue, and possibly 1 warm white; LM 317's so I can tweak the ratios.) Essentially, a copy of your 4+1 cake pan lamp but built on a 4 x 18" finned heatsink so I can see what's going on under it.) If I were to post my picks for power supply, resistor ratings / values, etc., would you critique and perhaps offer some guidance? I have already purchased Rating: 5