MeL1keS2SmOk1e
Active Member
I just finished my first grow with CFL's and it went well but I have decided to go with HPS/MH. I purchased a 400W system with a vented hood, and will be using a 6" duct fan to keep the light cool. How close can I put the fixture to the plant when using my MH bulb, or my HPS bulb? Also how many plants do you think I could cover with the 400W system. Supposedly the HPS puts out 55,000 lumens and the MH conversion bulb puts out 36,000 lumens. Even though the light will be air cooled/vented, I'm a little concerned about burning or killing a young plant. Thanks for any advice.