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.

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

How does it work?

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

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’)