On LCD displays dark mode actually uses more electricity; the brightness is always there, and you need to power the liquid-crystal layer to block that light to result in darker colours.
This whole myth about darker screens saving energy goes way back to the old CRT days when it actually did save some energy.
In case you are using an OLED screen or one of its variants, the difference is noticeable since they turn off the pixels that are black and, therefore, less electricity is consumed.
On LCD displays dark mode actually uses more electricity; the brightness is always there, and you need to power the liquid-crystal layer to block that light to result in darker colours.
This whole myth about darker screens saving energy goes way back to the old CRT days when it actually did save some energy.
Yall remember Blackle?
In case you are using an OLED screen or one of its variants, the difference is noticeable since they turn off the pixels that are black and, therefore, less electricity is consumed.