thanks but that's not powdery mildrew its diatomaceous earth. I think if u use equal wattage of LED that you would have used HPS then the yield will be equal or at least really close.Hard to find good quality LEDs without paying a mint. The ones from china are all hit and miss, the spectrums aren't always spot on, I grew some pretty decent bud using 5 90-watt led UFOs and a couple large cfl, buds were smaller than HPS but good quality. From my experience yield is based mostly on wattage, each watt gets you .3-1 gram, more than likely about .6 per watt on the average. The best reasons for led use are because heat is not able to dissipate, and keeping power to a minimum. If you have good ventilation I would go HPS every time just for the higher yields. I saw some powder residue on the soil, use some sm-90 and it will help that out.
Oh and Trousers you need to drop your light closer if you want tighter nodal distance.
^^^No they don't, you just tell yourself that. If you've never owned a decent panel how do you know your lights are that good? You don't. I've owned Blackstars, Vipars, 5x60s and sure you can grow weed with them, you just have to pay the e company more money per month. True efficient diodes cost money and if the Chinese were making diodes like that they would charge the big money for them. They're not stoopid. Oh have you sold anymore of those shit panels you were pushing last time i saw you around?