Last winter I used a 1000 w HPS lamp with great results. This year I was thinking about reducing heat and power with a lower watt bulb outfit. Just what am I going to expect with a lower watt bulb,..say 600 - 750 watts?
Dropping400 watts of lighting power is quite alot, dropping to a 600 you would be able to grow less plants, unless using a light mover then you would prob manage the same amount of plants as you had under your 1000 watt.
