its a 3 way light bulb, 17 23 29 watt..it i have it on 29 watts.. and the temps are average 74-76..and this is in a box in my room and i have a black tarp to cover it. the light stays on 24 hrs a day. should i do 18on and 6 off or stay with all the time? and i have a fan in there that is blowing right over the top of the plant below the light..could i keep it sealed with the tarp or should i leave a little bit open for fresh air or should i just leave it off the whole day? thanks