You'll adjust the light until it maintains the correct temp that you want it. turn it up a little under half and adjust up as needed. Also when you mist for humidity the temp will drop for a bit as moist air is cooler than dry air. Unless you mist with warm water. Keep me posted. Try and keep the fake plant if you have one under the light so the beam doesn't sit directly on the substrate. Not necissary but I usually do it that way.