Usage History of 'illuminance'

The following chart shows how frequently 'illuminance' appeared in printed materials over time. For example, the word 'illuminance' occurred 1 time in books in 1850 and 5,269 times in 2008. From 1850 to 2008, the word 'illuminance' was used a total of 194,947 times in books scanned by Google. See Reference: Google Ngram project.

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