Hey Chromophore, I get the lights down to 6 inches from the tops or less. I have a fan blowing directly down the "gap" between the tops and bulbs, really helps.
Same with the HPS. I could bring that 150 down to 12 inches from the tops with my inlet fan hitting the gap.
Way cooler to run the T5's...but when summer hits I'm going to have cooling issues regardless.
OMB Reviewed by OMB on . Will 150w HPS outperform 372w of T5HO? Well, I'm going to Find out! Only really applies to me and my particular grow, but a worthy effort anyway. A couple day's ago I put two under the T5's, and two under the HPS. I think the HPS at 150w is about 18,000 Lumen?...and the T5's are pushing 35,000 Lumen. I will throw a couple pics up when the "wakeup" tonight, should be interesting anyway. Predictions? Rating: 5