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Experimental study of humidity control methods in a light-emitting diode (LED) lighting device

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Light-emitting diode (LED) lights can reduce greenhouse gas emissions significantly by using electrical energy efficiently. However, the sensitive characteristics of an LED change with temperature and humidity. Humidity is directly related to performance degradation (The durability and efficiency) of electronic devices, including LED lights. Solving the problem of heating or humidity is important to ensure the reliability of an LED product. We examined commercially available humidity control methods, and experimented with MILSTD- 810G (Military Standards United States) to evaluate humidity on the global climatic environment. As a result, even though an LED light satisfies the IP66 grade, if it has an air vent, there is a strong possibility that condensation will occur in the lamp during a sudden change of temperature and humidity in an environment of high temperature and humidity. Because methods of using heat pipes and fans increase the dry-bulb temperature, the relative humidity (RH) decreases slightly. In the case of the thermoelement method, when the thermoelement was working, the humidity ratio was about 0.0185. When it was not working, the humidity ratio was about 0.0215. In the case of the absorbent method, when absorbent was in the lamp, the humidity ratio was about 0.008. Comparing two tests, the water vapor in the air decreased by 64%.

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Correspondence to Tae-Beom Seo.

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Recommended by Associate Editor Jae Dong Chung

Chul-Sook Kim received the B.S. and M.S. in Mechanical Engineering from Inha University of Incheon, Korea in 2006, 2008. He is in a Ph.D. course from the same graduate school. His main research areas are heat transfer and humidity phenomenon of lighting device such as LED and automotive headlamp.

Tae-Beom Seo received the B.S. from Inha University of Incheon, Korea in 1982, M.S. from KAIST of Daejeon 1985, and Ph.D. from Rensselaer Polytechnic Institute in Troy, NY USA in 1994. He is a professor with New Renewable Energy Lab, Inha University, and is presently a director of Incheon Technopark.

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Kim, CS., Lee, JG., Cho, JH. et al. Experimental study of humidity control methods in a light-emitting diode (LED) lighting device. J Mech Sci Technol 29, 2501–2508 (2015).

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