So what has to be right for a metal to release electrons when shot with a light? if you use more than whats needed will it still work? can this be used to power something? what else should i know about it? I wanna buy some 5mm LED bulbs to mess around with. from my understanding you can make them any color you want by changing the current that goes through it, is that correct? and does it have to be some special LED or is it any? thanks for all the help and sorry if my questions are dumb, i just learned about this stuff a few days ago.