Low Light Level Type 21


The standard yellow coating used for the dial the on board chronographs s, as well as the TYPE 21 BNL series, is intensified by black light and gives the green fluorescent  display optimal sharpness.
 

The needles and numbering on the TYPE 21 are covered with SuperLumiNova®, which upon absorbing light energy can then emanate a phosphorescent light seen in the dark.




Low-level cockpit lighting similar to ultraviolet and the use of light amplification goggles require
specific treatment to onboard instruments.


The standard yellow coating used for the TYPE 211 onboard chronographs, as well as
the TYPE 21 BNL series, is intensified by black light and gives the green fluorescent display optimal sharpness.


Unlike the SuperLumiNova®, this treatmentndoes not remain visible without specific low-
visibility lighting.