Quote Originally Posted by Stryker420
Hell with it I decided to do it rite and bought a 400 watt HPS. About how many plants can I grow under this light, and how high should I keep the light above my plants?
Depends how old the plants are, for seedlings keep it pretty high above it...to give you an example, I kept my 1000 watt about 5 feet away from my clones at first (kind of a waste of energy but didnt have many other options) so if you have young clones or seedlings, maybe 3-4 feet away I would say. I believe once the plants are mature enough you want to get a 400 watt about ten inches from the tops of your plants (18 for a 1000 watt) If it burns your hand, it will be burn your plant..otherwise, try and see how low you can get w. them. Are they air cooled hoods?