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Originally Posted by wild man
UPDATE: That's looking like it was a bad call. From what I see (on velocity network), they are already available on VERY high-end cars right now, albeit with 3 per side for a total of 6 per vehicle!
I have already seen a 3.3 watt single LED flashlight that put out 130 lumens. I think that's about 1/3 of what is needed per headlight for a single LED. It comes down to more a matter of getting the reflector/lens setup right to form the emission pattern of the LED into to the desired beam pattern in an efficient manor.
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We have 400 watt single LED's we've created at my job. Bright sun of a guns. I think the real problem with having them as headlights, is getting rid of the heat, LED's need a much lower operating temperature than regular bulbs. When you make one of large wattage, it can be difficult to drawl all that heat away, which means a very short life if its not done properly.