safelight

[seyf-lahyt]
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:
1900–05; safe + light1

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World English Dictionary
safelight (ˈseɪfˌlaɪt)
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
SafeLight detects and automatically photographs cars and trucks that run red lights.
Safelight filters are selected to transmit light outside the normal spectral sensitivity range of the film that is used.
SafeLight cameras automatically photograph the license plates of vehicles whose drivers run red lights.
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