So I need help understanding the whole ballast stuff. First of all, what exactly is a ballast? I know you need it to light up bulbs but what makes it so special? I have a 48in t5ho odyssea fixture and don't understand what people mean when they say like icecap ballast are good and stuff. What are icecaps? Would I be able to replace my odyssea ballast with an icecap ballast? Would it put out more watt/par or something? Sorry for so much questions. Hope you guys could really explain this to me.