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one minute on, 3-4 minutes off. this keeps the fog pretty constant in the chamber, but prevents the fogger from getting the chamber too hot. i used an arduino to do this. you could use a 555 timer but the arduino is very easily reprogrammable.

i painted over the LED's on the fogger in my grow chamber. took like 5 coats of paint to really block it, but much easier than trying to take the unit apart.