With Int. Int. and Average Low Light on you will (should) get a valid value... Eventually. But it can take a seriously long time, as all processes run extended durations.
And for the Extra Delay value there is no actual benefit at all in having Int. Int. and Average Low Light enabled - that we can think of.
But, as with all things ColourSpace, we do not disabled them from being used, as you just never know if a user may want to enable them for some reason we have not thought of...
Steve
Steve Shaw
Mob Boss at Light Illusion