" JimH" wrote in message
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"Bill McKee" wrote in message
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"Eisboch" 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.


How about the standard 12v bulb used for anchor lights?

I don't know what their wattage rating typically is. My guess would be
somewhere between 10 - 20 watts, given that they are required to be seen,
what, 2 miles away at night?

Eisboch