I only have a 2x2 tent so a hps wouldnt work. I just run a smaller ceramic heater in my tent on a thermostat. When the lights are on it doesnt even run. When they are off i dont get the massive temp fluctuation. It does remove humidity also but that's not a bad thing through flower anyway really. Easier to add it then remove itThe only reason I would consider going back to hps is because it's damn cold in my basement in winter and I could use the extra heat. If it comes down to a 1000w heater or HPS I think I'm going to go the HPS route.