I don't think either of us were talking about flowering with CFL's. We are talking about veg only. It is of my opinion that using anything other than CFLs or equivalent is OVERLOAD and wasteful to energy usage. To each his own though. You may find it is more effecient to run a HPS if you have a larger footprint to cover or you may not ....depending on your setup. I have yet to ever "flower" with only cfl's and I see so many people that assume that I do for whatever reasons. I think they just look at a few pictures and don't bother at all to read. Which obviously is a huge problem for people and their aptitude for knowledge.