Both MH lights and HPS lamps will work well for plant growth. The thing that people talk about is MH lamps emit a spectrum of light for vegitation growth that works the best and HPS light emits a spectrum of light for flowering that works the best. Both will still work for either cycle though, so if you have only one or the other and cant afford to buy another set up I wouldnt worry about it.
rnf232s Reviewed by rnf232s on . Metal Halide or HP Sodium? I have tried a metal halide lamp for the first time recently, and didnt think that it gave me as good results as my previous choice of bulb (HPS). I heard that MH were better for vegative growth, and to swap to HPS for flowering, is this true?? Any advice would be most welcome! cheers. Rating: 5