I used two p300's in my 2.5 x 2 x 7 foot space. At first I thought it might be overkill, but after seeing your readings, it makes me feel better about the purchase. With good ventilation, you should be able to keep the temps around 66 in dark and 80 when the lights are on full blast.
sorry, accidentally posted this in the wrong forum, so im reposting it here.
Aloha! Long time lurker, first time poster. I have gotten tons and tons of great advice from this site and looking forward to starting up my first grow journal once I have everything dialed in.
I have two 300w LED...