Prototype of a luxmeter with high sensitivity suitable for long-term data recording

This This paper describes the development and testing of HK-01 Data Logger luxmeter. This luxmeter is able to operate automatically and record obtained data. This device is used to measure illuminance and it is characterized by a wide range, from 10mlx to 100klx. Its resolution is 1mlx. This device makes possible both manual and automatic range setting, as well as recording obtained values into the luxmeter´s internal memory, either automatically in set time intervals, or manually. Recorded data can be viewed on the display, or exported into a computer. Furthermore, this paper describes the testing of this luxmeter in a photometric laboratory, looking especially at its directional pattern and spectral qualities. The testing was carried out with the use of JETI specbox 1211 professional spectroradiometer.