76 for me
Edit: summertime temps creep up a bit. I don't have a chiller on the system, but I run a dedicated ac unit for the fish room and another for the living room with the display, so temps can reach 80 in the peak summer months.
Mine was creeping up a bit after adding another wave pump just dropped it down it has been right around 78.6 before the lights hit 100% an about 77.1 at full intensity.