high hum. issue!!!!

jimmy slim big

Well-Known Member
so my box is 4 x6 x 6 i have a 600 watt hps, fresh air intake duct from window at bottom, hot air blower fan at the top and a circle fan blowing back and forth.... when m lights on the temp and humidity are perfect! 70-75 and 50 - 60% .... but when the lights are off the temp drops to 60 ish and humidity jumps to 70..... what can i do??
 
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