Lunar provides intelligent adaptive brightness for your external display.

Lunar controls the same brightness that you can change by using the monitor's physical buttons.

Unlike other software that only simulates a brightness change by adding a black overlay over your screen, Lunar uses DDC (Display Data Channel) to send commands like set brightness to 30% or switch input to HDMI 2 directly to the monitor.

This keeps the color rendering closer to reality, consumes less power, and minimizes the backlight bleeding effect.

Apple displays get special treatment as Lunar uses an implementation hidden inside macOS Display Services to control them natively.

The list of displays include:

Pro Display XDR

LG Ultrafine

Thunderbolt Display

LED Cinema (when connected via USB)