Just to clarify, mates, low idle is 21.5%, but HIGH IDLE has no fixed values, the
average is 32% in flight, reducing at slower speeds and colder temperatures.
The conditions for the light are: below 25% N1, or below 45% N1 with ignition on FLT (as installed on the autothrottle) above 500ft radioaltitude.
Engine antiice is not a factor.
