1.NounExcess light supplied beyond the amount required for a given task.
2.NounWasted light through illumination of an unoccupied space, creating energy wastage.
3.NounExcessive 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."