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maintained average luminance
; 
value below which the average luminance of a specified surface is not permitted to fall
Note 1 to entry: The maintained average luminance is the average luminance of the specified surface at the time maintenance should be carried out.
Note 2 to entry: The maintained average luminance is expressed in candela per square metre (cd·m−2).
Note 3 to entry: This entry was numbered 17-751 in CIE S 017:2011.