keyboard – Caps lock LED colour

I have a keyboard with an LED on caps lock, which can be on (white), off (… off) and it can be red if it is on low power.

The file in sys/class/leds/imput4::capslock has the file called brightness which is 0 or 1 to say if the light is on or off.

Is it possible to set the keyboard LED to red, and if so, how?