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by Night_Thastus 1276 days ago
Complicating this is that OLED displays also strongly limit brightness in order to reduce wear, via an automatic brightness limiter. How they do it varies by manufacturer and you'll see different results if only part of the screen is bright versus if all of it is bright.

The only way to get good numbers would be to take several OLED TVs, a few LCD TVs, and measure their power usage at the outlet after calibrating them to be as close as possible, then running through several different test playbacks.