Safelight

 

An enclosed light fitting that screens out the light rays of frequencies that can fog photographic emulsions. Used mainly in darkrooms before and during processing, it could be a LED light or a conventional light fitted with a filter.

A safelight is in a sense a misnomer, as there is really no safe light. Any light that is sufficiently bright to be of any practical value will affect the material if the exposure is long enough.