Decided I would put the work in and convert all the temperatures to F for anyone looking on more familiar with it.
Overnight low temperature 20.5C/68.9F
Overnight high 22.4C/72.3F
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The temperature controller successfully operated the space heater 9 times to keep it in those ranges. This is about a 6C temperature difference from when the lights were on.
Since there is no extraction at night humidity soared as soon as the temperature dropped. It remained constantly between 77 and 78 RH.
View attachment 958806
I have not disturbed the room yet, curious as it is now 2 hours into lights on and the room remains cooler and more humid than yesterday.