This new fixture to Zoo Med's lineup is an easy way to provide the various lighting options into one single fixture. It has two ceramic fixtures with separate chords, plugs and switches on the chord, so you can run one or both lights on a timer, dimmer or a thermostat. 

Some common light combinations are:
Repti Spot heat bulbs with a UVB producing compact fluorescent (when night time heat is not needed). This combination provides UVB and light through the coil bulb as well as heat and light through the spot bulb. 
Mercury vapor bulb with a red bulb. The red bulb can be left on 24/7 to provide night time heat to the reptile, and the mercury vapor bulb can be set on a timer which will turn on during the day to provide the reptiles with UVB, heat and light.