I remember a dentist office I went to in the past that was basically in a house that was repurposed and rezoned for commercial use.
Inside had the typical layout of a house with the standard ceiling heights and such, but modified to be a dentist office with some modifications.
The lighting was a number of 4 & 2 bulb T12 surface mount troffers and wall lights which were 5000K. I don't think the electrical system there was too happy because the lights seemed flickery and briefly dimmed whenever a dentist started up a machine, and all the LCD monitors would go black for a second.
I haven't been there in over a decade, I imagine it has since been changed with T8 and probably LED by now. This wasn't some sketchy place either, the dentist is a well respected one. The area is mostly modern commercial shopping buildings with a handful of old houses here or there that were there when it was all farmland, and are now used for businesses.