So Ive been hearing a lot about growers using CFL lighting for growing. But a good friend of mine, grows only using cool white and warm white fluor tubes. Also I hear MH and HPS can be good for growing too. To clarify, Im just talking about the vegetative state. For flowering, I'll probly use HPS. I just wanna know what you guys recommend for veggie period. Also about how much lights and wattage/lumens would I need? My grow space is about 4X4 sq feet with like 9 or so feet of height.
6500K CFL bulbs is what you want for vegetative growth. You want a minimum of 2,500 lumens per square foot & minimum of 50 watts per square foot(MINIMUM). In the world of growing with CFLs more is always better.