Photometric Sensor

The LI-210R Photometric Sensor measures light with the same sensitivity as a typical human eye. The photometric sensor is ideal for evaluating illumination in work areas, exhibits, interior lighting, and in public spaces. Measurement units are lux or klux.

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Why choose the LI-210R?

  • Spectral response closely matches the CIE Standard observer Curve
  • Excellent cosine response—sensitive to light from all directions up to an 82° angle of incidence
  • Detachable sensor simplifies installation and removal, making it ideal for platforms with complex cabling
LI-210R Photometric Sensor

How does it work?

The LI-210R measures light with a precision filtered silicon photodiode that is sensitive to light in the visible spectrum.

Photometric Response Diagram
Typical spectral response of the LI-210R Photometric Sensor
Cosine Response at an angle of incidence of 80 degrees

Learn more about the science and engineering behind the new design

LI-210R Specifications

  • Absolute Calibration: ± 5% traceable to the U.S. National Institute of Standards and Technology (NIST)
  • Sensitivity: Typically 30 μA per 100 klux
  • Linearity: Maximum deviation of 1% up to 100 klux
  • Response Time: Less than 1 μs (2 m cable terminated into a 604 Ohm load)
  • Temperature Dependence: ± 0.15% per °C maximum
  • Cosine Correction: Cosine corrected up to 82° angle of incidence
  • Azimuth: < ± 1% error over 360° at 45° elevation
  • Tilt: No error induced from orientation
  • Operating Temperature Range: −40 °C to 65 °C
  • Relative Humidity Range: 0% to 100% RH, Non-Condensing
  • Detector: High stability silicon photovoltaic detector (blue enhanced)
  • Sensor Housing: Weatherproof anodized aluminum housing with acrylic diffuser and stainless steel hardware; O-ring seal on the sensor base
  • Size: 2.36 cm Diameter × 3.63 cm (0.93” × 1.43”)
  • Weight: 24 g head; 60 g base/cable (2 m) with screws
  • Cable Length: 2 m, 5 m, 15 m, 50 m (6.5’, 16.4’, 49.2’, 164’)
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Check out the LI-1500 Light Sensor Logger and LI-250A Light Meter.

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Have a data logger already?

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