Late to the party but what the heck, story time. So once upon a time on a military trip we had to shower in small shipping container like units. There was a whole row of them all powered by a generator.
The living quarters were communal so to leave to go shower I had to use my trusty light (Streamlight Protac 2L-X) coving up the low beam with my hand to keep it dim enough to see but not wake anyone.
Anyway so this generator failed while I was showering. The water pressure/temp would still be good for a few minutes but no lights. So reached out of the shower, turned on the streamlight, pointed the beam at the ceiling and finished up. I'm glad I brought it with me! Hearing the stories about the guys who normally used phone lights had to fumble their way out of the shower containters were funny to listen to though!
As for my home shower, some family gifted us warm light LED night lights from AUVON and they are great for the candlelit spa vibe!