Mkay I have an led light and I figured I would make it grow the tiny ball of java moss, I feel so ghetto now..
So I have like a little tiny bit of water in a betta cup and I taped the led light to the lid of the inside, and a TINY ball of java moss is in there. I hold the "spotlight in place in the 10 gallon and the cup magnifies the light given so it lights up the other half of the tank :) Now I have it rigged so no fishies can jump out, and the cup cant skink, and no water can get to the light part. wewt. and if the java moss does grow in there, then that is a bonus, I mostly put it in there to keep it from my aquarium atm, I am not sure what I wanna do with it yet.
I made a spot light for aquarium... instead.