Dark mode / night mode apps have long known that you can extend battery life on smartphones with OLED screens. And so on Android. The same is true for iPhone. This is because the individual pixels do not use the juice at all when displaying the black, as they have to do less work in the dark areas of the screen. According to SlashGear Google re-emphasized several slides comparing power consumption across multiple colors in this week's Android Dev Summim. (The company originally used the Pixel smartphone for this data point.)
You can see that white uses the most power from a distance. This has led us to recognize that the importance of white in their apps and Android style guidelines is ideal. It is everywhere and it does not change to Google's modified material design.
Fortunately, the company seems to recognize the value of dark mode. YouTube and Android Message already include this feature, and we will import this feature into the Phone app and test it on mobile Google Feed. Android can be set up with a dark theme in the Quick Settings pulldown and app drawer, but Google has not yet gone ahead with adding system-wide night mode. (That's what Samsung plans to do with the new One UI.)
As an example of how to get a battery in the dark, look at the huge difference that Pixel is set to 100% brightness. Power saving effect in dark mode is obvious. I use the traditional look of this app most often, but it's good to know that Google recognizes the comfort value of all white.