When I entered the room today temperature was 30 degrees and humidity 85%. During the night the intake-fan had died and there was no fresh air coming into the room (except the passive air sucked in by the under-pressure created by the exhaust-fan). Luckily I had one spare fan, so I replaced it and I got the enviromental factors back under control. Happy I discovered this before things went south. The intake-fan was brand new and lastet for a total of 12 days. Can't say I am too impressed by that. Need to buy another spare-fan in case the same happens to this one.
When it comes to the plants, they are progressing very well. They clearly love the Mars Hydro lamps. No sign of stretching or any problems whatsoever - with the exception of the Northern lights plant I moved to a new pot. The growth on that one has clearly been stunted by the moving. Guess it's developing new roots and hoping it will eventually catch up with the others