humidity problems at lights off

ok so im into the 6th week of flowering and just recently got a hygrometer to check humidity as im plannin on drying some of my first plant in the same wardrobe im growing in, in a cardboard box. temps when the lights are on are around 60-70 and rh is between 30 and 40% but when i turn the light off an temps drop to as low as 50 some nights (no problems so far) but humidity is going up to 60-70% how can i lower it at night or should it be fine because it isn't as warm? buying a de-humidifier isn't an option at the moment either.

using a 250w hps in a wardrobe you can check it out in the link in my sig if it helps

any help is appreciated

are you still venting during lights off??

no, only have a fan on during the day

vent when lights are out bro at different intervals mate

If you exhaust during your night cycle humidity will drop.





J

and there is your answer..... happy dayz.

cheers lads