imo, im happier with my off-brand purchase (hy-grow lighting solutions) than i am with my SF-4000 or my Mars TS-3000. Dollar for dollar? These lights use the new 301H quantum boards, they have the same mean-well drivers.... and they cost less. still having a warranty. check these out by going to ebay & putting in item # 224099537146 into the search bar. i think the $219 (w $18 shipping) is the very best deal on quantum boards right now. that’s under $1 per watt. SF will cost around $1.33, and they (as well as my Mars) uses the older Samsung LM301b chip. Hygrow sells several versions, and i think the 250w is the best, as u can get several & space them out, getting better coverage. Your 4x8 will need about 4
I’ll add this, having started with HPS ballast/bulb setups. I damn-near melted my outlet with the power draw. And i constantly struggled with temps. Huge fluctuations from lights on to lights off. i now run all led’s, and because power is cheaper at night (and temps are lower) i light all night, dark all day. helps with cost & temps. if this is your first grow? Def go LED. the power consumption is STILL costly, but by a fraction of what it would be with hps