I just happened to notice that the light I'm using in my flowering cabinet is a mercury vapor not a metal halide does this matter. If so I can switch it with my new light, Just got ahold of a 150 w high pressure sodium light, only two plants in flowering right now, and three in seedling/veg stage. I guess I would like to know by your experiences which light helps which stage the best. I've read my book and I just want some growers knowledge also. by the way the merc light is 175 watt.