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They are both identical except the knobs are different colors

Both of mine are the gavita 1000 de ans they go from 600w to 1150w on the switch i have tried turning them off switching the knob and turning back on and no change I will post pictures when I get home

So a 1000w bulb won't dim if I turn it down to 600w if I want to run at 600 I need to get a 600w bulb and set the knob to 600 correct

Thanks for posting So I bought the lights brought them home plugged them up and they both came on and warmed up as the should, but when I turn the knob to change the wattage nothing happends. The knobs turn like they are supposed to. I took both of them apart all wires and connections are in...

Yes I got them from some guy they look brand new and they work as they should besides the switches

I have two gavits hpa 1000 lights i bought used and the wattage selecter switch does not work on either of them and I am new to HPS lights need some help