Thanks for help,
Then I will choose 400W HPS light!
I will use with this reflector:
One hot air out vent 365m3/h with termostat:
1) Fresh air in, what kind of vent I could use? I'm thinking to use 2 x PC vents (44.71 CFM; size 12cmx12cm), would that be enough?
Thanks a lot for your help,
Mari.