kThey don't make duel fixtures that have a dimmer switch to control light and heat output. In the end the cost would be the same. I reccomend the purchase of both bulbs and only one lamp with a dimmer switch and swap out the bulbs rather than changing lamps when it becomes dark. Also you save a little money buy just buying both bulbs and one lamp. For the day time bulb you can get an Exo Terra Sun-Glo tight beam and they also have a good infrared as well. Deep don't have a dimmer either and usualy produce too much heat. I purchased one and it is only good for fluorescent bulbs which you don't want to use for a heat problem because they don't produce suficient heat output and are too bright for Pacmans.