Quote Originally Posted by Psycho4Bud
3) I can position the lamps so they are on top and to the sides of the plants.

I never compared a yield but I would guess with the right lamp positioning, it would give a greater yield due to the intensity of the light in the lower regions of the plant. :twocents:
This was exactly what I wanted to say. Except I do it with just two 400W lamps. Two points of light (or 3!) will give a better light distribution. That 1000W lamp may be putting out 140,000 lumens, but if it is the only point of light over many plants, it's too far away from some of the plants to be any more effective than an incandescent. Light degrades exponentially from it's point of origin.
super420 Reviewed by super420 on . The Classic 400 Watt Versus 1000 Watt Debate Raw Power I would like your input on this subject.(I already have my own opinion formed) What final yield differences have you had or think would have from using a 400 Watt HID light versus a 1000 watt HID light? We don't have to get into the differences of horizontal reflectors compared to parabolic reflectors. Just theroretical or factual yield differences. Rating: 5