Chams need a drop in temp during the night, and even if the bulb wasn't providing heat, the light will keep them awake. Use a timer to turn the basking and the UV bulbs on and off daily. I like to have the UV bulb come on first in the morning then have the basking bulb come on about 1/2 hour later. Then have the basking bulb turn off 1/2 hour or so before the UV bulb turns off for the night. This sort of gives them a dawn, midday, and dusk light cycle. Depending on how warm the room gets during the day in summer you may not need to leave the basking bulb on all day...he'll want it to warm up in the mornings so he can patrol, hunt, drink, etc. If the room will get too hot at midday, you can set the timer to turn the basking bulb off for a few hours and then come back on after it cools off.