I've heard on other forums and sites that the Repti Glo bulbs can cause eye problems in beardies? Something to do with the wavelength of the UVB from them, or something? Before I got my beardie I did a ton of research and most people were of the consensus that the only proven safe UVB bulbs for beardies are the Arcadia and Zoo Med Reptisun 10. I use the Reptisun myself. Can anyone shed a little more light on this (no pun intended)? As far as length of UVB, correct me if I'm wrong, but I always heard it should go about 2/3 the length of the enclosure. So in my 40 breeder I have a 24" bulb.