20.500.12556/RUL-134463 Development and analysis of a modular LED array light source Light emitting diodes (LEDs) have experienced rapid technological development in the past decade, making them a winning alternative to conventional light sources in many applications. LED arrays allow precise control of the desired irradiance profile in a target area by adjusting the position and output power of individual LEDs. However, despite increased efficiency, many LEDs still transform a large proportion of the input electrical power into heat, requiring an efficient cooling system. This paper presents a modular LED array light source mounted on a water-cooled aluminum plate. Novel electronic LED driver modules, connected via a serial communication bus in a daisy-chain topology, were developed with the ability to set the operating current of individual LEDs. A modular layout of cooling and mounting system and LED driver modules, as well as a specialized design for the LED soldering footprint, was able to house a variety of common commercial LEDs, enabling easy adjustment of the lighting system to the required application and size of the irradiated area. In a prototype of one plate containing 10 LEDs, individual LED radiance was optimized for a better irradiance homogeneity in the target area. Array characterization showed a low standard deviation of the irradiance of 1.8% and a good fit between measured and calculated irradiance. A test of the array at elevated temperatures showed moderate LED radiance degradation and a wavelength shift of the measured spectra after extended use. LED light sources light emitting diode lighting system irradiance optimization degradation LED svetlobni viri true false true Angleški jezik Slovenski jezik Članek v reviji 2022-01-17 09:51:21 2022-01-17 09:51:22 2022-09-13 03:55:19 0000-00-00 00:00:00 2020 0 0 16 str. iss. 4, art. 92 Vol. 7 Dec. 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.383.51 2304-6732 10.3390/photonics7040092 42913027 RAZ_Mitterhofer_Stefan_2020.pdf RAZ_Mitterhofer_Stefan_2020.pdf 1 6A87EF3A8E62F6E12469D4CDA2CD6356 d933e09eaa00d77887cf8ad1fd75995cb0f1e2c5ecc58589f712b42894ab4781 878842f8-7773-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=152930 https://www.mdpi.com/2304-6732/7/4/92 1 75383bab-7772-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=152929 Fakulteta za elektrotehniko 0 0 0