Mischka
I use a 425 watt HPS bulb. My brother used a 1000 watt MH but it seems to burn the plants even when it is on a moving track and sitting 4 feet above the plants! I rarely have this problem with my stationary light. I think MH may be harsher light.
I have been pretty happy with my light and it covers a 3 foot square area pretty well.
Greg
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