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Open AccessArticle

Research on Luminance Distributions of Chip-On-Board Light-Emitting Diodes

Lighting Division, Electrical Power Engineering Institute, Faculty of Electrical Engineering, Warsaw University of Technology, plac Politechniki 1, 00-661 Warszawa, Poland
Crystals 2019, 9(12), 645; https://doi.org/10.3390/cryst9120645
Received: 24 October 2019 / Revised: 28 November 2019 / Accepted: 2 December 2019 / Published: 5 December 2019
(This article belongs to the Special Issue Recent Advances in Light-Emitting Diodes (LEDs))
Chip-On-Board Light-Emitting Diodes (COB LED) are increasingly more common. Their development in recent years has directly contributed to increasing the power of LED sources, whilst simultaneously increasing the luminous flux from the entire COB. Consequently, it has led to new developments in some applications. Information regarding the size of the light source luminous surface and luminance distribution on its surface is critical for a designer whilst designing optical systems. The purpose of this conducted research was to establish to what extent luminance distribution is even on the examined COB LEDs. In order to verify luminance distributions on an LED surface, direct measurements with a matrix luminance measuring device were made. As a result of the research, it has been observed that luminance distribution is not even, and in many cases luminance maximum does not fall in the geometric center of the luminous surface, which was initially expected. So, it has been concluded that while designing optical systems for COB LEDs, irregular luminance distribution on their surface needs to be considered. View Full-Text
Keywords: lighting technology; Chip-On-Board; COB; LED; COB LED; light-emitting diodes; luminance distribution; micro LED lighting technology; Chip-On-Board; COB; LED; COB LED; light-emitting diodes; luminance distribution; micro LED
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Czyżewski, D. Research on Luminance Distributions of Chip-On-Board Light-Emitting Diodes. Crystals 2019, 9, 645.

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