Setvar
To set the brightness level for the head open LEDs:
! U1 setvar "device.light.head_open_brightness" "value"
Values
"high"
the LEDs display at maximum brightness when the head is open
"medium"
the LEDs display at medium brightness when the head is open
"low"
the LEDs display at lowest brightness when the head is open
"off"
the LEDs remains off at all times
Default