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Scalar Irradiance

Scalar Irradiance Collector

Accurately Measure Total Incident Light from All Directions

This collector measures scalar irradiance, simplifying measurement of complex underwater light fields.  Like HOBI's other light collectors, it is designed for underwater use with HydroRad and HOBI fiber optic cables, but also can be used with other cables with SMA connectors.

  • Scalar Irradiance, E0
  • Responds equally to light from all directions, except the portion blocked by the collector base.


  • Angular response identical in air and water
  • Use with HydroRad for complete hyperspectral measurements
  • Totally waterproof when installed on HOBI Labs fiber optic cable
  • Also compatible with other SMA-terminated cables
  • All-plastic construction is corrosion-proof


  • Diameter: 6.4 cm (2.5")
  • Length: 11 cm (4.4") including SMA connector (stand-alone configuration)
  • Weight: 200 g dry, 20 g buoyant when submerged
  • Usable wavelength range: 380 to 1000 nm
  • Maximum depth: 200 m
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All specifications subject to change without notice.