cool ... actualy cool
no thats great .. make sure they are clean and can pull enough air out/in ..
maybe turn/tune them up if nesseary .. if the out take ventilation is that kind I postet ? and its old ? a new one is cheap ..
try to keep it around them 74F .. that is ok .. but dont go lower .. maybe try to get 75-78F at lights on .. 70F is ok for night time ..
also ... remember ... unless its a auto .. it needs complete darkness in dark time (only special green light if you realy have to go in ther) so might need to block any window/light leaks ..
5000k is ok if that is what you can get .. but try when you have some cash on your hands go get some decent lights if you refuse to go with HPS ..
safe up for a T5HO fixture and use the CLFs for side light on your nextt grow .. that would be my advice ..
here is a place ... they even have a sale ..
2" 8 bulb fixtur with a nice refletor and even included Veg. bulbs (6500K) 193,95 $
dont buy em .. just have a look and see what you can get and what it will cost .. and see what you yild with your CLFs on your fist trail run ..
but thats the kind you want .. with your 2700K CLFs around .. then you mgiht be able to grow decent plants with out HPS ...