http://www.growlightexpress.com/pages/ceramic-metal-halide-pv-c0-2.html I saw you question the Ceramic Metal Halide.
My grow room is 20"X 48"x 5.5". I use a CMH but it's 1000W with 2 120 x 120 PC fans top & bottom. Plus two inside fans for air movement.
I've hung a digi terminator 4" inches from the bulb and it reads 80*.
It's an amazing bulb cuz it's full color & as white as you get. I encloseed the link so you can see how it color output beats ANYTHING else on the market
My grow room is 20"X 48"x 5.5". I use a CMH but it's 1000W with 2 120 x 120 PC fans top & bottom. Plus two inside fans for air movement.
I've hung a digi terminator 4" inches from the bulb and it reads 80*.
It's an amazing bulb cuz it's full color & as white as you get. I encloseed the link so you can see how it color output beats ANYTHING else on the market