Definition of illuminance noun from the Oxford Advanced Learner's Dictionary

 

illuminance

 noun
noun
BrE BrE//ɪˈluːmɪnəns//
 
; NAmE NAmE//ɪˈluːmɪnəns//
 
(physics)
 
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a measurement of the amount of light that reaches an area of a surface
See the Oxford Advanced American Dictionary entry: illuminance