Humidity goes down with lights on and higher temps and will raise during lights out. Especially with no fan and filter to cycle air through the tent 
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A lot of people miss that relative part with humidity. @MattyBear has you covered.
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To add to matty’s Statement it will always fly up with no fans on at all in dark. Some scientific reason I don’t care to explain but I know you’ve seen the walls sweating by now
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90% at night is still too high. Relative or not.
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MUCH better. Happy these good folks got u covered. I actually run two box fans at night. Gotta keep that humidity in check. The more plant matter u have. The higher itll jump.
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I hate to leave a heater on at night, but for now it has to be my answer.
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I have to leave a heater on all night too because I grow in my garage. If you’re using a space heater, just make sure to plug it directly into an outlet and not to a power strip or extension cord 
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Even better if it’s a gfi outlet or protected outlet.
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Thank you i did do that directly into the outlet. I’m just trying to limit the amount of time I have it on. The next couple days are going to be very cold here.
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Looks like my humidity is still getting very high but things are looking good in there. I’ve been feeding a lot less this week and the darkness is definitely helping them grow. I’ll get the humity switch tomorrow @Bubblehead hopefully it’s simple to hook up!
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The manual is not written using the best English. I used page 6 primarily to get mine set up. If you have any questions please ask. After getting past the poor grammar I found not too difficult to set up.
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@dbrn32 I have a question about my light. Not sure if it’s the best for my situation? I’m in a 2x2 tent with a 1000w light. Here’s the link.
https://smile.amazon.com/gp/aw/d/B00PH1MQV8?psc=1&ref=yo_pop_mb_pd_title
It’s not the best in my opinion, but you shouldn’t be afraid to grow with it. Have you completed a grow with it? If you haven’t, I would try and see how you do.
I just kinda picked one so I knew it was going to be that answer. This is my first ever grow and the plants seem to be doing great, so far. Thing is I can still return this one and go for something better if have one in mind?
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A lot of people really like the qb 135 kit in that space. It’s about double the price though.
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If u can? Bucks i say DO IT!!! Your eyes’ plants, and jars will thank u later. Ur wallet may curse u out behind ur back but all wallets are just messy crybabies anyway right?
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Here come those nickels and dimes again. I have this brand of light, just a little bigger for the size of tent I have and love it.
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Hehehehe. Yup never ending story. DB said “itll grow ya some bud” and i just came from almost 8oz journal with a blurple lighting the way. But if he can get the cash back n swap up? I would
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Got a link? I don’t see it on amazon