The HID does put out quite a bit of heat, but is it going to be enough heat to keep your growroom at the desired temps and what are your growroom temps going to be like when the lights are off? This will depend on the area where your growroom is located and what sort of extraction system you've got. I'd do a test run over a 24 hr period and see what your temps are like before you decide to buy a heater or humidifier. I don't think the optimum temps change for the different stages of the plant. As far as humidity goes, i thought higher humidity was good for seedlings, but you should lower humidity in flowering as it may give problems with bud rot.

Good luck!
hudson88 Reviewed by hudson88 on . quick n00b question re: heating & humidity does the HID light provide the heat for the grow room too? or do i need a seperate heater/source? also as i need to control the environment inside the tent best as possible i was thinking of buyin a humidyfier because i heard they like it humid.. but im sure i also read somewhere that seedlings dont like it humid or it causes root or stem rot. does this mean i should only turn the humidyfier on after 5 nodes? thanks in advance :thumbsup: are there different preferable temps for the different Rating: 5