Output (sensitivity) 0.1 mV per W mˉ² Calibration Factor (reciprocal of sensitivity) 100 W mˉ² per mV Calibration Uncertainty ± 5 % Output Range 0 to 1 mV Measurement Range 0 to 100 W mˉ² Measurement Repeatability Less than 0.5 % Non-stability (Long-term Drift) Less than 2 % per year Non-linearity Less than 1 % Response Time Less than 1 ms Field of View 180˚ Spectral Range 310 to 400 nm (wavelengths where response is greater than 10 % of maximum) Directional (Cosine) Response ± 2 % at 45˚; ± 5 % at 75˚ Temperature Response Less than 0.1 % per C Operating Environment -40 to 70 C; 0 to 100 % relative humidity Dimensions 24 mm diameter, 37 mm height Mass 100 g (with 5 m of lead wire) Cable 5 m of shielded, twisted-pair wire; TPR jacket (high water resistance, high UV stability, flexibility in cold conditions); pigtail lead wires; stainless steel (316), M8 connector located 25 cm from sensor head