Development and analysis of a modular LED array light sourceMitterhofer, Stefan (Avtor) Korošak, Žiga (Avtor) Rojec, Žiga (Avtor) Jankovec, Marko (Avtor) Topič, Marko (Avtor) LEDlight sourceslight emitting diodelighting systemirradiance optimizationdegradationLight 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.20202022-01-17 09:51:21Članek v reviji134463UDK: 621.383.51ISSN pri članku: 2304-6732DOI: 10.3390/photonics7040092COBISS_ID: 42913027sl