Indoor High humidity during 4hrs of lights off

[realer_dn_most]

hey guys
this is my first post and first grow.
currently have 3 autoflowers in week 2 (AK, pineapple ex, rhino ryder)
my grow tent is 120x60x150 with a 450w dual spec LED, 4" incline fan and OX carbon filter with a clip on 6" fan for additional air circ. my current light cycle is 20-4. during the 4hrs off, temp is around 18-23c and humidity rises to around 70%.
temp and humidity when light is on is ok (21-27c 40-50%)

is this a problem for my plants considering the lights are only off for 4 hours?

thanks for any help. look forward to gaining some knowledge

 

[Jimmyclone]

You should get a dehumidifier, mould can take hold easily at that level.. Its better to try and only have 10% variations in humidity, if at all possible..
Cheers
Good luck

 

[Corgy]

Is your ventilation running during lights-out?

 

[Jimmyclone]

My ventilation fan turns on very rarely as its on a thermostat. Im running cobs now and there isn't a whole lot of heat generated.. I had the same problems when i was running hps.. Perfect light on temps and humidity, but super humid when the lights were out.. Dehumidifier is the answer bud.. You can dial in your environment.. Less moisture in your home.. Win win..
Cheers

 

[Jimmyclone]

You will be surprised with how much water u take out.. And the dehumidifier water can be reused..

 

[realer_dn_most]

Is your ventilation running during lights-out?

yh they run 24/7 and light out are between 1-5pm so its cool during the hottest part of the day.

thanks everyone for the help. think ill get a dehumidifier and run it when lights go out

here are some pics with no dehumidifier 4 week in.. think the moistures affecting it?