i just leave the fan on all the time and check the temp,, sorry m8 that was a typo , they r 6 foot in 5 week s , 4 weeks veg n they keep grow n 4 a bout a nother week in flowering , but yes , but they r in bucket s so they r really a bout 5 foot ,the pic in my profile is a clone at week 8 , 4 week s in 2 flowering , DONT TOUCH THE LIGHT BULB WITH YOUR FINGER S, or it will b fucked , by a book from ed just gogle it ,it make hrdro easy , lots of pic s to ,