Proposed thermal metric for assessment of cooling systems of LED lighting products

Shailesh, K R and Kurian, Ciji Pearl and Kini, Savitha G (2014) Proposed thermal metric for assessment of cooling systems of LED lighting products. In: International Conference on Circuits, Communication, Control and Computing (I4C 2014), 21 - 22 Nov 2104, Bangalore.

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Abstract

As the operating temperature of a LED lighting product increases, quite a few performance parameters experience a short-term and recoverable shift. With increasing operating temperature of a LED lighting product, forward voltage reduces, luminous flux reduces, and the color characteristics change from the desired characteristics. Furthermore, maximum junction temperature of the LEDs in the lighting product must not be exceeded. Exceeding the maximum temperature, as specified by the manufacturer in the product datasheet, may permanently damage the lighting product and cause irreversible shifts in product performance. In this work the concept of thermal characterization parameter is proposed to assess to quality of the cooling system in a LED lighting product. Currently, internationally there is no well established measurement technique or standard for estimating the junction temperature of LEDs in a market ready luminaire. Also there isn’t any well established method for assessing the quality of the cooling system of a LED luminaire. This work proposes a thermal metric relating the junction and the heat-sink temperatures to estimate the operating junction temperature as well as the quality assessment of the LED luminaire. Findings of the thermal testing on a LED down light are presented in this paper.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: LED lighting, Thermal characterization parameter, Thermal resistance, forward voltage method
Subjects: Engineering > MIT Manipal > Electrical and Electronics
Depositing User: Users 24 not found.
Date Deposited: 03 Dec 2014 07:38
Last Modified: 03 Dec 2014 07:38
URI: http://eprints.manipal.edu/id/eprint/141115

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