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Have you tried choking your plants?

Lower temps may help bring out those purple hues. Shock them with 50°F temp for a day or two in the cold and they may get some color. This is my usual tactic to get blueberry crosses to show their blueberry heritage. Another benefit to the lower temps is to signal your plants that fall is ending...

It gets so warm because of my dual bulb CMH fixture. Its open and puts out about as much heat as a 600w HPS but performs better than 1000w HPS. 80F is a problem, when lights out, because RH hangs at 80-90% with only an internal circulating fan. Mold and powdery mildew love that environment.

Picked up another dehumidifier from a friend and tested it out this morning with no changes to my air intake or exhaust! This thing kicked RH's @$$!! Drop kicked humidity from 75% to 30% in just two hours on max!! I had to crack open the tent with lights out just to lower the setting before I...

Great idea! I'll start a mission to find out what it is and where to get one!! Lmao!! I've considered dampers, like on a dryer exhaust. Let air one way but not the other. But if there is enough pressure inside the tent, it'll probably keep opening and closing them. This would surely minimize...

I've tried this already. And while it works alright during lights out, my home air is too warm in the winter to cool the tent from heat generated by the 630w dual bulb CMH fixture. I cant find an air cooled dual bulb CMH fixture, to help remedy the heat from this fixture.

Diggs99, If I run the exhaust 24/7, it helps with the humidity a little, but then it gets too cool inside tent. Just one fan running causes such a vacuum, that running only exhaust will draw cool air in from intake. Or the other way, just the intake on will suck too much cool air in and not...

Some pics here:

Second grow and looking for advice. I use a temperature controller to maintain my temps and the humidity is just fine while lights are on. When lights are out, my humidity jumps to 80%. No heat to remove the humidity in dark. What have others used to control humidity when connected to outside...