Wait tell us more about use your computer by candlelight… do you mean like red shift? Most OSes have this built in and there are 3rd party apps that can do candlelight settings
I've also tried dropping the aspect ratio on my 42" 4k OLED to 4:3 and not scaling the resolution to limit light output, but the pixel density ultimately seems to be a limiter. Since I can work on my smartphone at its lowest output and with redshift, a smaller, higher-dpi display may be key.