Lighting serves two major functions in a Bearded Dragons Life. The first is as a Mood Enhancer and Metabolic stimulator. Simply put, the brightness and duration of said brightness directly affects the lizards ability to metabolize vitamin D3 in their diets which results in weak bone formation and a multitude of other symptoms, and eventually death. The second function is heat. Bearded Dragons need heat to digest their food. They are Cold blooded, and this means that without an outside heat source, their bodies don't heat up, and no heat means no movement. Simply put, they need about 100 to 105 degrees for 4 to 5 hours a day at least to metabolize food normally.
At ALLABOUTBEARDEDS we use both fluorescent and incandescent lighting, in combination, to achieve as natural a lighting condition as possible. Always remember safety and care when using electricity. A change in temperature within the enclosure is also highly recommended. Try to make one end the hot end and one the cool or ambient end. This gives the Dragon the choice and ability to normalize its core body temperature. Never go to an extreme with anything. Always use discretion when designing you're Dragons enclosure. Always remember to account for hot bulbs and fire safety.