Thank you for your responses. We have a gray tub and it appears very dark in there.
I was thinking a recessed LED on low watt setting placed on top of the enclosure with a hole and secured and with a timer. Enough that the BP can escape the direct light if desired. 5000k daylight I assume. Plexiglass on the hole of course.
Another option is to cut open a square in the front of the tub and add plexiglass to allow natural room light in.
Most of all I want our BP to be happy and healthy.