Luminance analyser

A self-contained intelligent analyser that measures the level of brightness or luminance created by natural light around tunnel portals.

When integrated with a managed tunnel lighting system, its measurements ensure that drivers’ visual perception is maintained day and night, avoiding sudden variations and potential “black hole effects” when entering and exiting a tunnel.



  • CIE approved measurement of L20
  • Viewing angle can be specified 10°- 40°
  • Rugged 316 stainless steel design to withstand extreme weather conditions
  • Simple installation & mounting
  • Optional wash-wipe facility to minimise maintenance requirements
  • Direct connection to host controller
  • Onboard SCADA / PLC interface options:
    • Current outputs
    • Digital relays
    • RS485 (Modbus RTU)