I’m looking at lighting too … I’m looking at 12v lights as my sauna is outdoor and off-grid. I also want something I can tuck behind seat backs or under seats… I love the indirect lighting you see in a lot of sauna pics.

From what I’ve been reading, LED lights aren’t great in heat. It causes them to quickly fade and fail.

My current (crazy?) idea is plastic fiber optic glow cable.

https://www.amazon.com/dp/B07R4779CS/ref=cm_sw_r_cp_api_glt_fabc_7CV74ZKVKT4FHTC4S4WQ?_encoding=UTF8&psc=1

According to the seller, the material is ok to 80c, and the light source can be kept outside the hot room preserving the LED.

https://www.amazon.com/dp/B01MDUGSP3/ref=cm_sw_r_cp_api_glt_fabc_DJEFR1ABJGXFGP4W8P50?_encoding=UTF8&psc=1

I might buy some of the cable and pop it into a 180f oven to see what happens. :)