Abstract
LED luminaires have taken over other traditional lighting solutions in all possible lighting applications due to advances such as high lifetime, power efficiency, adaptability in size, shape, and different color generations. The reliability of the LED luminaire as a system was determined by the lifetime performance of the driver electronics. The advancements in power electronics led to more reliable components and products. The LED luminaire’s reliability is determined by the light output and color appearance quality, and quantity. The importance of single LEDs performance in the LED luminaires is most recently realized and needs to be explored. The manuscript presents the analyses of the lumen output and Duv based life estimation, the variations in color appearance in terms of xy chromaticity, and spectral power distribution of two luminaires having same electrical and optical specifications employing different type of LEDs subjected to different accelerated operating conditions. The results identify the predominant failure indicators for lumen and color changes, and show that LED physics & device packaging also play a significant role in the reliability study of an LED luminaire. The results of the manuscript are helpful for LED luminaire manufacturers to enhance the lifetime of LED luminaires by suitable moderation in the LED package design in terms of lumen output and color quality maintenance as per specific application requirements.
Highlights
LED lighting is one of the most popular lighting technology of the current era due to its variable physical designs, low power consumption and very high reliability compared to other traditional lighting solutions [1], [2]
The LED light engine consists of multiple/single LEDs arranged in series/parallel combinations of connections placed on a PCB
Recent literature [6], [7] suggests that LED luminaire as a system would have a shorter lifetime than a single LED alone, as the failure of driver electronics would fail the LED luminaire system
Summary
LED lighting is one of the most popular lighting technology of the current era due to its variable physical designs, low power consumption and very high reliability compared to other traditional lighting solutions [1], [2]. The LED luminaire lighting system contains two main subsystems, the LED light engine, and the LED power electronic driver. The LED light engine consists of multiple/single LEDs arranged in series/parallel combinations of connections placed on a PCB. The power electronic driver provides constant current to the LED circuitry to glow the LEDs at specific light levels. The LED driver consists of an AC-DC converter, and a DC-DC constant current converter with an electrolytic capacitor placed parallel to output to reduce the ripples to the LED luminaire [4]. Due to the latest advancement in the power electronics components field, higher resilient components, VOLUME XX, 2021
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