for sure. I use HPS through my entire grow, and plan to always use HPS unless it's actually going to make a significant difference (and i'm doing SoG so my clones will never be vegging, just root then flower). But i see people always say MH for veg, HPS for flower, but then i hear you get about the same results running HPS the entire way. So keep in mind you can do the entire grow in HPS if you wanted too, and still get about the same great results. With hps being better than CFL's. Supplement with CFL's. You also don't have to worry about frequencies with HPS like you do with CFL's. I believe it's the frequency that determines the wavelength (that 4000K number or "whatever"K number you see with cfl's).