Quote:
Originally Posted by mcgyvr
12in^2 per watt? ha ha ha ha...
Black box LEDs are doing WAY more wattage than that...
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first off I want to say 12 sq inches per watt IS extreme but ssumes passive cooling..
BB's use 2 fans....and run about 2W at the diodes..
100W-ish is probably a more realistic "guess"..
180 sq " boards..Lets just say 2 sq " per watt w/ active cooling..
Reefbreeders use finned heatsinks and fans on some of their boxes..
Actually surface area "could be" is much larger.. based on this:
It's a Mars Aqua hort light. much bigger than a black box though.
CORRECTIONS:
suspect smaller bb's have no finned heat sink
Many use 3 fans for cooling..
@12square inches per real watt. for 100w flat plate would be around 34"x17" plate passive.. w a large margin of error (not really subtracting any diode footprints.)