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what type of bulb

I just got my High Intensity Discharge Lamp in the mail today. its 400w system it came with a MH light and HPS light wich one is best for growth. how far away should the light be from my plants.
 
I just got my High Intensity Discharge Lamp in the mail today. its 400w system it came with a MH light and HPS light wich one is best for growth. how far away should the light be from my plants.
If you want to get finicky, use the MH up until the plant starts flowering, then switch to HPS... Personally I'd just use the HPS though. They're safer if theY fracture as well (If your MH breaks, you run away, lol).
 
MH is the bulb for veg (ie growth). HPS is for flowering and fruit. Also, how old are the plants? That will play into the distance. I am not a fan for seedlings unless you can put them like 4 or 5 feet away (lost about 100 seedlings at 400w and 3.5 feet). For older plants (about 3 weeks or a month with a few sets of true leaves) you should be good at about 3 feet or so. BE CAREFUL! If they start purpling, move the light up!
 
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