I know that they sag whenlights go out but they are starting to wilt as soon as the lights turn on. by the end of the 18 hours they arent looking to hot. I have the temp on thermostat set at 76 because the way the a/c kicks on and off it fluctuates up 4 degrees when a/c shuts off then takes 5 minutes or so to get back down. My thermometer at canopy level reads 79 when thermostat says 76. When i set it to 83 degrees it fluctuates up to 86 or so and just feels really hot in there. I havent ruled outputting the temp up and dealing with the fluctuations. thanks a lot for your replys.