I haven't asked her for anymore details since I left because it upsets her to talk about it. Her mom, who helps care for the dragons, seems defensive and gets angry when I ask as well.
However, while i was visiting with them they purchased what they called a "vitamin light." I would assume this was what they were thinking provided the UVB. The light that they purchased that moment was a Zilla Night Black Heat Incandescent bulb.
I'm a BP person so I haven't had to do much reading on UVB light but what I just read suggests that the particular bulb they bought produces very little UVB because it is incandescent. This could be where in lies the problem. On the flip side, idk that this is the bulb that they purchased every time. I just know that its what they bought the other day.
I will send her a link to this thread later when she gets out of school. Maybe it will help her.