You mean a ballast?
Unless you are runing incandescents, spiral power compacts, or burning a lantern, yes, you do need one.
I can't help you on the last one. What kind of light are you running?
I think this may help you. Rex's Guide to Planted Tanks
Unless you are runing incandescents, spiral power compacts, or burning a lantern, yes, you do need one.
I can't help you on the last one. What kind of light are you running?
I think this may help you. Rex's Guide to Planted Tanks