I'm thinking that MBD is not your fbt's issue. Here is another ariticle that is specifically about MBD...........

http://www.anapsid.org/mbd.html

There is a link on lighting at the bottom of that page and I sort'a thought the part on fluorescent lights hit the mark and I generally agreed with most of the article. Incandescents if daytime heating is needed (which it's typically not needed for FBT's) and fluorescents for general lighting and providing UVB.

The fad, (IMO), with many seems to be LED lighting, but LED's don't produce UVB. The only LED fixtures I know of that claim UVB actually have a fluorescent or other bulb built into the fixture to provide the UVB.