What type of lights do you buy and how much do they cost?
Loaded question there. I prefer L.E.D. and have stayed with HLG for my brand, others grow successfully with just about most types of bulbs. Now days with the advances in tech L.E.D. is really the most efficient and quickly becoming the most cost effective all around. But to each his own. As for cost, we that depends on alot of factors. But I DIY my light and spent just under 500$ and have around 500 watts at the light.