As an element of architecture, a laylight is a glazed panel usually set flush with the ceiling for the purpose of admitting natural or artificial light.[1] Laylights typically utilize stained glass or lenses in their glazing.[2][3] A laylight differs from a glazed (or closed) skylight in that a skylight functions as a roof window or aperture, while a laylight is flush with the ceiling of an interior space.[4][5] When paired with a roof lantern or skylight on a sloped roof, a laylight functions as an interior light diffuser.[6] Before the advent of electric lighting, laylights allowed transmission of light between floors in larger buildings, and were not always paired with skylights.[7]
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