Cogsinister
Super Member
Technically, LED's work on a certain current, rather than voltage. Typically, you'ld take the voltage you have, minus the Vf (forward voltage drop) of the LED, divided by the current you want. So, if I wanted 20ma through a 1.6 Vf LED @ 50 volts: (50 - 1.6) / .02 = 2420 So, I'd use around a 2.4k resistor.
I made the mistake of reading this before my first cup of coffee this morning.....