"This is the only light I will use for my bearded dragon, Bramble. I did research before purchasing a flourescent light for him. I found out that some people are actually using too high a percentage of UV radiation for their reptiles. You might think more is better, but reptiles can get cancer, especially in their eyes, from constant exposure to high UV rays. A 5% bulb should do very well, as it is not too much, nor too little. It will provide the benefits your reptile gets from sunbathing himself!"