Founded in 1954, BIRNS, Inc. of Oxnard, CA, is a leading manufacturer of high-performance lighting and connector systems for deep-ocean and nuclear use. In addition to the famous Snooper, Kelvin, Corona and Blackbirn, BIRNS manufactures over 40 other types of lighting products, and six different connector ranges. Connectors indlude Aquamate wet-mateables and Millennium high-density deep-submergence styles.

- Choice of 25 to 50-watt lamp
- Choice of four different lens options
- Superior thermal design permits the use of higher-output lamps than in competing models
- BIRNS' exclusive "doubly safe" dual helium release method

The BIRNS MODEL 4121 Doubly-Safe Chamber Light is an extremely popular light for general-purpose illumination. Extensive testing has proven the BIRNS Chamber Light to meet or exceed applicable Det Norske Veritas (DNV), Lloyd's, and UL requirements.