light leakage; leaking through of light
Refers to unwanted light passing through a gap, such as around curtains, doors, or camera seals.
I'm bothered by the light leaking through the gap in the curtains.
This camera is designed to prevent light leakage.
Compound of 光 (ひかり, 'light') and 漏れ (もれ, 'leakage', noun form of 漏れる).