> Is half a lot?

> No. Human light perception works on a log scale, allowing us to maintain useful vision over 6 orders of magnitude of luminance, from the sun at noon to moonless nights, whereas halving is .3 orders of magnitude. In relative terms, halving light is a tiny blip of the dynamic range of vision.

Kind of missing the point that:

a) a display emits spectacularly less light than the sun, even on very overcast days

b) said "blue light" reduction is presumably intended to happen at night where 1) any comparison with the ability to maintain unsaturated vision in plain sun on a clear day is largely irrelevant and 2) backlight itself is typically lower than in daylight (not for OLED which does PWM)

So given that the amount of artificial light to not screw up with sleep is about equal to "none at all" I'll take a cut in half of what essentially constitutes a flashlight aimed straight at my retinas any day.

> Here are four things that can help. [...] Use dark mode [...] found reductions in luminance ranging from 92% to 98%! That’s huge.

From my anecdotal experience dark mode and other low contrast themes are mostly used by people who set their brightness too high, and conversely people switching to dark mode immediately crank brightness up.

Countless discussions I had:

"my battery holds poorly"

"using dark mode?"

"yes"

"try light mode"

"but my eyes!"

"turn brightness down"

"done. wow I just reclaimed 1-2h of battery"