Might mean (unverified): Excessive light causing discomfort, waste.
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We found one dictionary that defines the word overillumination:

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  1. overillumination: Wiktionary

Definitions from Wiktionary (overillumination)

noun:  Excess light supplied beyond the amount required for a given task.
noun:  Wasted light through illumination of an unoccupied space, creating energy wastage.
noun:  Excessive or annoying light producing glare, annoyance and adverse health effects.

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