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maintained average illuminance
; 
value below which the average illuminance over a specified surface is not permitted to fall
Note 1 to entry: The maintained average illuminance is the average illuminance over the specified surface at the time maintenance should be carried out.
Note 2 to entry: The maintained average illuminance is expressed in lux (lx = lm·m−2).
Note 3 to entry: This entry was numbered 17-750 in CIE S 017:2011.