The Hagner ELV-841 Light Sensor is designed for continuous, stationary outdoor measurement of illuminance.

The Hagner ELV-841-L Light Sensor is designed for continuous, stationary outdoor measurement of luminance. It consists of a Vλ-filtered detector and an amplifier with regulated current output (4-20 mA). Measuring range is specified with order (e.g. 0-250 cd/m²).