It sounds like you are trying to flower one set of plants under 12/12 and grow another set under 12/12. it doesn't work like that. 12/12 triggers flowering regardless of the size of the plant. If you started your Afgani under 12/12 you are going to lose most (if not all) of your yield.Can i use a 400 HPS through the whole grow cycle--the prob I have is I have a flowering girl on 12/12 and I am growing Agani buds still veging and I am supplimenting them with Full Spectrim Floresances. My question is how much will I loose on the Afgani yield. After two weeks of this regiment they are getting wider but not Taller.