I have tried everything 'obvious', every panel and floodlight control I can find, nothing worked.
EDIT: ok. so I reloaded the sim and aircraft and the light is working now, full right on that background control turns on the fluorescent light, turning left turns it off Certainly was not doing that before and the background control was the first knob I went for. You might notice in my original screenshot all the background lighting was off yet the fluorescent was still on? Seems fine now, thanks again.