depends a lot on temperatures, strain, ventilation, etc. But a 150 watt hps will not put out more heat than a typical light bulb or two, so you're probably ok there.
khronik Reviewed by khronik on . El Cheapo Guide to Lighting A guide to cheap lighting for the broke newbie stoner Fluorescent Bulbs Fluorescent tubes have good efficiency and put out very little heat, but they usually aren't intense enough to produce a lot of buds. Still, for the vegetation stage of growing, they're great. All types of fluorescent bulbs usually have several numbers written on them that you should pay attention to. One is the watts. This determines how much energy a bulb uses, and also how much light it gives off. The Rating: 5