"Bill McKee" wrote in message
.net...

"Eisboch" wrote in message
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wrote in message
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First version, otherwise why use 6 resistors instead of one single
lower ohmage one of higher power.


I was trying to roughly calculate the power requirements. You said 600
ohm resistors, correct? The voltage drop on the LED will be minimal when
forward biased or "on", so each branch must be about .02 amps, times six
equals .12 amps, so the power must be about 12v times .12 or about 1.4
watts. Probably a bit more when you factor in the LED drop, whatever it
is. Significantly less than a regular light bulb!

Eisboch


Most LED's are in the 400mw range.

Does that include the new, high powered ones? The are being used on trucks
for brake lights, turn signals and other places to replace bulbs. They are
incredibly bright. Maybe the brightness is due to optics being used, like a
Fresnel lens or something.

Eisboch