I found this in another post just wondering if this is the right way to go...
C_Pac 
marijuana Toker
marijuana Toker
Join Date: Nov 2006
Posts: 123
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MH provides the best spectrum (quality of light) for vegetative growth (the period from seedling to maturity). HPS provides the best spectrum for flowering. The flowering stage is more important because that's when you're making budzzz. You can use HPS for vegetative growth, but with slower, less lush results. Many people around here have had good results just using compact fluorescents of the right spectrum for vegging instead of MH, too.
what do you guys think?