equivalent veiling luminance

[5.9.11.9]

NOTE: This term was added in RP-16-17 Addendum 1.

The luminance that would need to be superimposed on a scene in object space to reduce the scene’s contrast by an amount equal to the added retinal illuminance from scattered light on the scene’s retinal image.  It is most commonly used to describe the contrast-reducing effect of a glare source in the field of view.  Sometimes also called veiling luminance or disability glare.

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