Does anyone know how far or wide the range of light is from a t5 light? I'm trying to find out how far/close I should put my new fixture so I can get the widest range possible. It's an 8 light 2ft t5 light fixture. I know I can have them pretty dang close but I want to know how far back I can set them while still casting a usable range of light?.... I hope this makes sense