It is a zoo med non coil
UVB light in a ceramic housing.
Can we see a pic of your bulb? If it screws into a ceramic housing and it is a ZooMed bulb, then it is a cfl (compact florescent lamp), aka: coil type bulb. The fold over "U" shaped types that ZooMed makes are also considered coil types, and this could be the source, or part of your issue. Those bulbs hurt their eyes, and it can make them not want to eat.
Swap it out for a tube type bulb instead and see if things change.