Quote:
Originally Posted by Vikesrock
Shouldn't power calculations be done with RMS voltage and current?
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Yes, that is correct, because the heat generated is not constant but pulsed, and the important factor is the average power not the peak.
RMS is a mathematical construct used with sinusoidal signals to account for the 'real world' effects of such non-constant voltages. Using RMS in this calculation is good engineering practice.
On the other hand, I doubt the meter is really measuring RMS, more likely just 'close enough'. And that's OK.
Also, in the LED specs, it states the max reverse voltage is 5~6 volts? I'd pick the lower (5) and make sure you manage that. Put a regular 1N400x diode in series to half-wave rectify it (turning it into pulsed DC) and don't subject the LED to any reverse voltage.
Don