BIRNS PVHO lighting systems safely operate inside Pressure Vessels for Human Occupancy (PVHO), especially HeliOx helium-atmosphere diver decompression chambers.

• The BIRNS Model 4121 Doubly-Safe Chamber Light is extremely popular for general-purpose illumination. It meets or exceeds applicable DNV, Lloyd's, and UL requirements, and offers lamps up to 50w, choice of 4 lenses, and BIRNS' exclusive 'doubly safe' dual helium release method.
  
• The BIRNS Model 4132 General-Area Chamber Light is perfect for general-area illumination, and offers choice of 12V or 24V, and power outputs up to 28w.
  
  
• The BIRNS General-Area Chamber Light is now available in a connectorized format! This unit, Model 4134, accepts the same power cable assembly as the Model 4121.
  
  
  
• The BIRNS Model 3031 Dual-Outlet Power Supply is outside the PVHO, and provides independent power to two BIRNS chamber lights, with power ON/OFF, 0-100% variable dimming capability, GFCI Protection, and slim, standardized 19-inch rack-mount enclosure.