Budz Lightyear
Member
I have never heard of any one dimming a HPS or MH or these grow lights even having a dimming option on the lights.
Most HPS do have a dimming feature. My 1000w light has 600w/750w/1000w/1150w.
I'm thinking it might have more to do with temps anyway. But I'm basing that on nothing more than a gut feeling, lol.