well first of all, you can use the HPS all the way through for growing. second of all, how big is your grow room? this is going to determine more than anything how many plants you can fit under that 200 watt lamp. how man lumens does this light put out? you need a minimum of 2000-2500 lumens per square foot to grow bud, 5-7000 would be damned good, and anything above that will give you excellent yield.
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