Lighting a Bathroom Tub?
Per NEC 410.10.B there is a restricted area 8' above the rim of the tub and this extends 3' to the side of the tub this is why you usually do not see lighting in this location. But it can be done with a fixture listed for wet locations. These fixtures usually seal so water cannot get in. If this is only a tub not a shower a damp location fixture could be used (not getting splashed) but I prefer the wet location fixtures.