I went through the other videos this person posted and yep. They were living together. Before this chameleon their was a veiled chameleon. I'm assuming it died. Probably killed by the iguana, stress of living with iguana, or the MBD it clearly had. This person also has other reptiles. This is...
a lot of things must be taken into consideration with UVB - Todd from LYR just actually posted a thread that very informative when it comes to UVB, let me grab you the link:
https://www.chameleonforums.com/using-arcadia-12-bulbs-education-key-12-not-always-best-option-129982/
Well..... Is it at night? Or during the day?
Also, Jackson's shouldn't be given supplements everyday. They are more sensitive to them then say, a panther or veiled.
Never put lights inside the enclosure. Ever. Unless it's surrounded by like, chicken wire or something. You can simply buy a bulb that puts out higher UVB and avoid the chicken wire and hassle of hanging a light inside the enclosure, but yes, that is true. Mesh filters out a lot of UVB.