Originally Posted by siriusflier
Plugged one directly into a battery, it got hot, but didn't burn out, probably still needs a small resistor.
depends on color. blue and white (which are actually blue or uv internally) may run up to 4v. red likes 2v better. green is in between. ive added a couple red to my v929 and v939 boards with no resistor. current draw is only a few ma and will probably last forever. almost no effect on fly time but quite a treat when the sun goes down.