The Senseca LPPHOT01 is a photometric probe for illuminance measurement, designed for continuous indoor monitoring of lighting conditions. The probe measures illuminance in lux and features a spectral response matched to the standard photopic curve V(λ), providing measurements aligned with the sensitivity of human vision.

The LPPHOT01 is specified as a Class B luxmeter probe and uses a photodiode, optical filter, and diffuser. Incident light generates a photocurrent, which is converted into a potential difference across a shunt resistor. The resulting signal can be read directly with a suitable voltmeter or digital multimeter, with no external power supply required for the probe.

The measuring range is 0…200 klux, with a calibration accuracy of better than 4%. To improve angular response, the probe uses a cosine-corrected diffuser, with f₂ below 3%.

Each probe is individually calibrated, and its specific sensitivity factor is marked on the housing and used to calculate the measured value.

To achieve approximately 1% reading precision, the probe output should be connected to a digital multimeter with an input resistance greater than 100 kΩ.

The probe operates over a temperature range of 0…50 °C and is housed in a compact Ø30 mm × 38 mm enclosure with a 5 m cable for connection to the reading instrument.

For more information:
https://www.senseca.com/en/product/lpphot01-photometric-probe-for-indoor-illuminance-monitoring