Fish/aquarium and plant ‘improve’ lights, either incandescent or fluorescent, never make UVB. You'll need a black light which emits gentle from the 290-320 nanometer vary. Lights producing only UVB, and lights which create a mix of UVB and white lights can be found. ZooMed’s reptile or iguana lights, and Durotest’s http://dantevncsh.collectblogs.com/14807447/argentine-tegu-no-further-a-mystery