keylight

Package keylight allows control of Elgato Key Light devices. MIT Licensed.

keylight CLI

Command keylight provides a command-line interface to control Elgato Key Light devices.

$ go install github.com/mdlayher/keylight/cmd/keylight@latest

The default device address is http://keylight:9123 which you can set up as a DNS name or similar for ease of use. With no arguments, the device is toggled on and off while retaining its existing brightness and color temperature settings:

$ keylight 
device "keylight", light 0 on: temperature 4200K, brightness 20%
$ keylight 
device "keylight", light 0 off

You can also query the device's status or modify its parameters using other flags:

$ keylight -h
Usage of keylight:
  -a string
        the address of an Elgato Key Light's HTTP API (default "http://keylight:9123")
  -b value
        set brightness to an absolute (between 0 and 100) or relative (-N or +N) percentage
  -d string
        set the display name of an Elgato Key Light device
  -i    display the current status of an Elgato Key Light without changing its state
  -t value
        set temperature to an absolute (between 2900 and 7000) or relative (-N or +N) degrees