Day 15 - Girls are both going strong. Pushing out new leaves every day, Still no nutrients yet.
Day 17 - I raised my light up about 6 inches last night. Temps were consistently around 82, so I wanted to cool things off a bit. Temp was 72 when I checked on them this morning, which is a little lower than I would like, but it was a cold night last night. We'll see what the temp is tonight. I may have to adjust exhaust fan and vents to find the right balance.
Day 17 night - Temp was at 70 when I checked on the girls. I closed the vent directly behind the pots to see if that will raise temp a bit.
Day 18 - Temp was 75 this morning, but humidity had dropped to 10. I think closing that vent created too much suction from the exhaust fan, and it's pulling out my moist air. I opened a vent on the other side of the tent. I will see how that works. Girls don't seem to mind either way. Still going strong.
Day 19 - That did the trick. 75 degrees and 30% RH!
Good luck with the grow!
As for the RH, you're right, probably have 'too good' air exchange and the fresh air that comes in is relatively dry, although 10% seem a bit low even then. You can put the exhaust on slower speed or connect it through a timer ;)
@bobo420, I'm having a hard time finding the right balance. If I lower the fan speed, temps go up. I put a clip fan in the tent last night to circulate air a bit better and lowered the exhaust fan. We'll see what that does.