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

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