safelight

[ seyf-lahyt ]
/ ˈseɪfˌlaɪt /

noun Photography.

a darkroom light with a filter that transmits only those rays of the spectrum to which films, printing paper, etc., are not sensitive.

Origin of safelight

First recorded in 1900–05; safe + light1

British Dictionary definitions for safelight

safelight
/ (ˈseɪfˌlaɪt) /

noun

photog a light that can be used in a room in which photographic material is handled, transmitting only those colours to which a particular type of film, plate, or paper is relatively insensitive