400 how close?

How far do I have to set the lights from my plants? I'm rockin a 400 dubb metal halide

The best way to test it out is to put your hand between the plant and the light.....test the heat at certain distances with the back of your hand and set it where u won't feel too much heat

I do what SmokeDr420 says.

yeah thats what I do but I just want to make sure this fucker is hella hot