Quote Originally Posted by bcals0087
keep them no closer than 18 inches, any closer, you'll feel the heat on your hand like the dutch pimp said. And at 18 inches with a 400w your actually giving them more light than the sun is, according to the light scale!
You must've been looking at the 1000W. Actually a 400W at 18" only gives about 40% of what the sun does if you look at the chart that DutchPimp posted....