You can also turn way down the brightness & save even more power if #000 & #fff are used to get a low contrast. Seems folks forget about this adjustment as anyone using a low-contrast theme for their site makes me crank up my brightness just to read it. Books being high contrast black & white wasn’t an issue since it’s in ambient light, but if your screen is brighter than ambient, then of course you’ll want a low-contrast theme, but you could have just lowered your brightness.

I’m happy with my OLED phone, laptop, & monitor while not having daily driven a IPS device in 5 years.