I know a guy who needs some portable floodlights for videography and lighting a DJ booth. He wants me to design a LED based floodlight so that they don't generate so much heat. Battery life is not that important because he can use lead-acid batteries, but 12v would be nice. This is what he initially wanted:
http://www.bigclive.com/flud.htm
http://i280.photobucket.com/albums/kk164/bigclivedotcom/flud13.jpg
Note that he does NOT need RGB capabilities, but he does want white, 5-6kish output, and he wants them to fit in the floodlamp housings.
That design uses halogen floodlight housings. It uses 54 leds and has no heatsink, so it looks like pretty much pre-luxeon technology. I'm thinking a better route would be to glue some modern LEDs to a piece of aluminum, more like this:
http://www.textklick.demon.co.uk/54leds.jpg
I think a chunk of 1/4" aluminum with some modern LEDS glued/screwed too it would be the way to do this nowadays, either with a resistor or LM317 for current regulation.
What white emitters would be good to use to cheaply get as many lumens as possible on the lowest budget possible? I think if it was as bright as a 100-200W incandescent he would be happy.
http://www.bigclive.com/flud.htm
http://i280.photobucket.com/albums/kk164/bigclivedotcom/flud13.jpg
Note that he does NOT need RGB capabilities, but he does want white, 5-6kish output, and he wants them to fit in the floodlamp housings.
That design uses halogen floodlight housings. It uses 54 leds and has no heatsink, so it looks like pretty much pre-luxeon technology. I'm thinking a better route would be to glue some modern LEDs to a piece of aluminum, more like this:
http://www.textklick.demon.co.uk/54leds.jpg
I think a chunk of 1/4" aluminum with some modern LEDS glued/screwed too it would be the way to do this nowadays, either with a resistor or LM317 for current regulation.
What white emitters would be good to use to cheaply get as many lumens as possible on the lowest budget possible? I think if it was as bright as a 100-200W incandescent he would be happy.