Well, I have to agree, half of the people on here don't know anything about UVB bulbs, they just say what they heard. I used a reptisun 5.0 on my beardies for a year, and they are absoultly the healthest beardies I have ever seen. My experience is if you keep a reptisun 5.0, 3-8 inches away from your beardie you will be fine, I used a reptiglo 5 cause my bulb broke and my beardie acted no different with the reptisun or the reptiglo, alot will dissagree but that's my personal and opinion, with my experince, I have learned about this forum that some think you can't bend the rules a little but I have tested it andy beardies are very heathly and produced 39 eggs and all have hatched. You can beleive my personal experience ( even though every one dissgraces my for my age) but I have proved alot and I wish people would listen sometimes.