Along with the 250hps Ill have a 50watt led and after the 30 days I'm gonna buy some new lights so I can have total 600-700 watts in there.Should be fine and id say probably 12 inches to cover the whole canopy. I wouldnt really flower 6 with only 250 watts
Thank u brotherJust about any light source is "enough" to grow a plant. How well/healthy the plant grows, will be dependant upon quality/abundance of light.
Keep the 250w a good 18-24in away, and you shouldn't have any issues as far as heat/light stress. Should be able to cover a 3'x3' area with a 250w iirc