/sci/ - Science & Math

dumbest question of the month here. I'm trying to hook up three leds in series to 120vac american wall socket. current is 20mA and voltage is 3.2 to 3.8 max.

1. How to (easiest way) step down the voltage from 120 to 3.8?

2. Should I run them at Max voltage? I want max brightness from them, I assume the cons of running them at max voltage will lower their life by a month or so over five years

3. if I am running them in series do I need to increase the listed amperage or voltage to drive all three of them?

Currently i'm using 2 C cells to drive one 1.5+1.5 = 3 volts which is outside the low end of the typical voltage they are to be run at

pic related