THAT ZILLA FIXTURE HAS A CLEAR PLASTIC COVER ON IT THAT COVERS THE UVB TUBE AND BLOCKS 100% OF THE
UVB LIGHT FROM GOING THROUGH IT!!! YOU MUST REMOVE THST HARD, PLASTIC COVER FROM THE FIXTURE IMMEDIATELY!!!
UVB light cannot penetrate glass or clear plastic at all, so please remove the cover immediately. Also, that Zilla Desert 50 UVB tube is fine BUT ONLY IF IT IS MOUNTED UNDER THE MESH LID, AND THERE IS ABSOLUTELY NOTHING BETWEEN THE COMPLETELY EXPOSED UVB TUBE AND YOUR BEARDIE WHILE HE IS BASKING!!!! You'll have to poke holes in the mesh lid and then use either large zip ties, wire, twine, etc. to strap the entire fixture to the underside of the mesh lid. ALSO, YOU MUST MAKE SURE THAT HIS MAIN BASKING SPOT/PLATFORM IS WITHIN AT LEAST 6" OF THAT EXPOSED, UNOBSTRUCTED UVB TUBE!
So first remove the hard, plastic cover from the fixture and then figure out where his Main Basking Spot is and then attach the entire fixture to the underside of the mesh lid so that it is directly over that Main Basking Spot. Then ensure that his Main Basking Spot is high enough that it puts him within at least 6" of the UVB tube, really 4-5" is better for that light, this is the only way that he will get adequate
UVB light from the Zilla Desert 50 T8 UVB tube...PLEASE BE SURE THAT HE GETS AT LEAST BETWEEN 13-14 HOURS UNDER BOTH THE UVB TUBE AND THE BRIGHT WHITE BASKING BULB!!!...ALSO, YOU ABSOLUTELY MUST REPLACE THAT TUBE ONCE EVERY 6 MONTHS LIKE CLOCKWORK BECAUSE IT STOPS EMITTING ANY
UVB LIGHT AT 6 MONTHS OF USE DAILY USE, EVEN THOUGH THE TUBE WILL NOT BE BURNT OUT AT THAT POINT AND WILL STILL TURN ON AND EMIT REGULAR LIGHT, IT WILL NOT EMIT ANY
UVB LIGHT AT ALL!
Make sure you put his bright white basking bulb right alongside the UVB tube, so that he will get both lights while he's basking, this is how you replicate natural sunlight for him while he basks.