running it close! The canopy level is staying around 85-87 F with the 23 watters in there. Below the plant is holding up at about 81-82 F. It's a good setup with the 23 watt bulbs. It can defininetly handle summer time heat however, my container is too big for the volume of grow space i have. I am noticing yellowing tips that are indicative of a plant asking for more light. I am trying to figure out a way to upgrade at least 1 bulb to 40w for extra density but, summer in South will probably have something else to say about that. I'll be beginning the hunt for cheap power tools to begin my cabinet project in the next 2 weeks.