High Blades, I'm in week 2 of flower under 336 actual watts CFL. My 400w HPS ballast and light arrived today and I'm starting at 75%. With CFLs I had to get the lights as close as possible to the plants. Do I set the distance from new HPS to plant based strictly on temperature management and not burning plants? Thanks!!!
Better to start a good distance away...say 24" and gradually move closer ....plants don't like sudden change.
Yes, you don't want them to get too hot. I am using two 1000W MH right now over my plants and I think they are about 30" away right now.
As far as light is concerned, I don't think you can get the light too close. (Doing it gradually, of course.) Heat is the bigger problem. Mine are snuggling up to the air cooled tube of my HID light.