Quote Originally Posted by Tokudai

Plants have the ability to withstand 80, 90, even low 100's with no problems when measuring with the thermometer directly in the beam of light, as long as the ambient (shade) temperature is low enough. When its 85+ in the shade, thats when you see problems start to pop up from temps
Quick question: I recently abandoned a grow cab i made due to heat issues. The ambient temps halfway up the 24"x16"x48" cab were in the 78-82 F range but the temps under the light (150w cfl) were close to 90-94 F.

Considering the ambient temps would it REALLY be ok to have plants in there? I cant imagine this being ok with the 90+ F temps under the light. But please correct me i have a lot to learn...