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Home :: Chamber Lighting :: BIRNS® Model 4121 Doubly-Safe Chamber Light™

BIRNS® Model 4121 Doubly-Safe Chamber Light™

BIRNS® Model 4121 Doubly-Safe Chamber Light™

General Information

The BIRNS Chamber Light is the world's best and most versatile PVHO lighting fixture. It meets or exceeds applicable Det Norske Veritas (DNV), Lloyd's, and UL requirements. It is versatile, with choice of lamp and lens. Superior thermal design permits the use of higher-output lamps, and BIRNS' exclusive "doubly safe" dual helium release method makes the entire front of the light its own helium release valve.


The low-voltage Chamber Light is designed specifically to provide "white light" illumination inside pressurized HeO2-atmosphere PVHO chambers.

The BIRNS Model 4121 Chamber Light provides:

  • brilliant "white light" illumination
  • small size (Ø76mm / 3" OD), mountable almost anywhere
  • lamp and lens options to make it perfect for most applications
  • Superior heat-sink design, two helium release methods, low-voltage lamps and a case ground (earth) connection make the Chamber Light very safe to use.
  • All Model 4121 lamps operate well on AC or DC.

 What You'll Need

To operate the BIRNS Model 4121 Chamber Light, you'll need a CEF3S16-x Power Cable Assembly ("-x" is the length in feet). We'll make any length or configuration you wish. Optional cable locking sleeves are available in plastic (63A-004) or 316 SS (63A-003).


SKU 4121 Doubly-Safe Light
Quantity in stock No items available
Weight 1.50 lbs
Our price: Call For Pricing!
Select Lens:
Quantity Item currently out of stock but available for purchase. Please contact for estimated delivery dates, (855) 482-8324.

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