Over-illumination Definition

noun
Excess light supplied beyond the amount required for a given task.
Wiktionary
Wasted light through illumination of an unoccupied space, creating energy wastage.
Wiktionary
Excessive or annoying light producing glare, annoyance and adverse health effects.
The building's architect failed to account for natural light availability and specified more lighting fixtures than needed, resulting in over-illumination and leading to increased headache incidence for some building occupants.
Wiktionary