Did you try backing off on the hours or adding a potentiometer to regulate the light. I've tried both and had only mild success. I'm been dragged kicking and screaming into the 21st century. Just swapped to a viparspectra xs4000. Early days yet but a few of the mixed seeds I put in are showing really nice results. They've just started creaming up (as I call it coz they're girls) and gelling up the lower parts of the shade leaves. All white hairs still. Put in about 8-10 different strains to SOG. Marked them all by number and took around 6 clones off each. Will update with pix. If it works well I'll invest in a few more LED panels. It's mid winter here and I have a little 2400watt heater to keep the tent at 26C. Surprisingly it isn't using all that much power. Comes on for about 2 minutes every 15.