Hi,
I used to have a UV for my BP's back in the day (er... late 90's in my case ). They are hardly ever out in the day to get any benefit from it.
But .... Talking pictures under one sure looks purty.
I also think supplemental vits every once in a blue moon couldn't hurt - but you can certainly give them too much of some vits and with a healthy whole prey item they probably don't need any at all.
dr del