Also does anyone have exsperience building their own cobs. I've been thinking about building my own that way when the lights loose their intensity I can simply switch out the chips instead of buying a whole new light. I've been doing research and whatnot but there's alot of data but I could care less about a graphs or numbers I wanna see results and actual whole grows not just 1 picture of a tent with plants in it under the light. I'm staying away from the autocobs bc of some things I've heard and the parts they use. I'm going with the Cree CXB 3590 top bin chips but am looking for the best heat sink and components. Figured I'd throw out a line and see who bits.