Dam, I ran into a slight problem since switching to12/12. My humidity jumped up to 99% by morning, and dropped only to like 68-75%. I recently swapped one of my two 600s hps for a 1000w king double chip led. I want to play around and see what combined lights would do. Plus it's cheaper to run at around 200w=1000. But it doesn't produce heat, which helps dissipate the moisture. I stopped foliage feedings once I begin flowering, because of the humidity problems. To counter it I figured to hell with it, and took my 600 back out, removed the reflectors inside and out, leaving the tube and bulb, and put my MH bulb in. You must be thinking just use a dehumidifier idiot! Well, I wasn't happy with the LED 1000watt. And adding a dehumidifier ups my bill, which I didn't want to do, hence the investment of the LED. For the long run. So if I'm gonna use more power, why not put my 600 on 75%, hang it vertically, with no fan connected, increasing the temp, drying the air, while banging my ladies with another 400w of MH. For a total of 600hps, 400 Mh, and 1000w full spectrum LED. This will be interesting. I indeed did plug in a dehumidifier for the 12 hrs dark, energy star on low, everything leveled out in the morning when lights came on, temp was 64degrees , rh 52%. That was 7 am. By 10am temp 83degrees rh 55%. Perfect for me. It's quite odd, I haven't done any research on it, but there's no going back. It's how I'm finishing this run. All spectrum.lol