When you switch from CFLs to HPS, do it gradually...start the lights twice as far from the plants as you want them in the end, and lower the lights over a couple of days. HPS light is a lot stronger than the CFLs, and you'll get some shock or even burn if you aren't careful.
Roughrider Reviewed by Roughrider on . I'm back with a few light questions! Hey guys and gals, I haven't been here in a while but I have a few questions regarding lights..... 1. I have a fluorescent grow light in a chamber with plants 1 month old about 2-3 inches away from the light. Not including heat, can a plant ever be "too" close to a light? The distance between leaves is extremely nill so I'm curious if this will affect bud output. 2. When is a good time to make the switch from fluorescent to HPS? Thanks in advance all! Rating: 5