If you are worried about high temps, and your lights create heat, you should adjust the lighting schedule so that the lights are off during the hottest part of the day.Yes they come on at 9am and off at 9pm, the temps are now 22c in the room and 25.4c in the tent so its rising again.
If they are now running, leave them on through the night till 9 am and then shut them off...have then come on 6-8 hours (or whatever your interval) later after the hottest part of the day has passed.