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https://doi.org/10.3938/NPSM.68.472
Novel Optical Design of a Marine LED Lantern Using a Double Reflector Instead of a Conventional Fresnel Lens
New Phys.: Sae Mulli 2018; 68: 472~476
Published online April 30, 2018;  https://doi.org/10.3938/NPSM.68.472
© 2018 New Physics: Sae Mulli.

Jung Sik JOO1, Deuk Saeng LEE1, Hyo Jong PARK1, Hyun Kyoung YANG*2

1 Deokseong Ocean Development Co., Ltd., Busan 49040, Korea
2 Department of LED Convergence Engineering, Pukyong National University, Busan 48547, Korea
Correspondence to: hkyang@pknu.ac.kr
Received November 15, 2017; Revised March 5, 2018; Accepted March 19, 2018.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Marine lanterns are installed on light buoys for safe navigation of ships. Marine lanterns used oil in the beginning of the 1900s and light bulbs starting in the 1950s. Since 2003, the light-emitting diode (LED) marine lantern has been undergoing improvement. However, the only major change has been that ordinary bulbs were replaced with LEDs while the installation and the configuration remained the same. Fresnel lenses are used for transmitting light rays in parallel but are difficult to design and are costly. Therefore, we replaced the Fresnel lens in the marine lantern with a reflector. An Illumination optics design program (LightTools) was used for the simulation of the light distribution according to the LED-200 standard for a marine lantern. The brightness of a LED module of the cross type using 5 LED chips and a power of 3 W was found in the simulation to be 441.7 cd, which satisfied the average horizontal brightness of the LED-200 standard.
PACS numbers: 42.79.-e
Keywords: Marine lantern, Optical design, LED, Simulation


August 2018, 68 (8)
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