You really need to get a bright white light, red or, any other colored light distorts their vision and confuses them. You will need NO visible light on at night or any color and, as long as your house temps stay above 65 at night you won't need a heat source.If it does get lower than that, a CHE is in order to keep the temps between 65 and 75 "NO hotter". If he is gaping at night, it is way to hot for him to rest. Dragons like it cool and, dark so they can slow their metabolism and, actually rest when they sleep.