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The Effect of Different Filament Arrangements on Thermal and Optical Performances of LED Bulbs

1
School of Science, Shanghai Institute of Technology, Shanghai 201418, China
2
School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China
3
School of Science and Engineering, Curtin University of Technology, Kent Street, Bently 6102, Australia
4
Hangzhou Silan Azure Technology Co., Ltd., Hangzhou 310018, China
5
Zhejiang MKOPTO Co., Ltd., Shaoxing 312073, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(4), 1373; https://doi.org/10.3390/app10041373
Received: 24 December 2019 / Revised: 17 January 2020 / Accepted: 21 January 2020 / Published: 18 February 2020
(This article belongs to the Section Energy)
The influences on thermal and optical performances of light emitting diode (LED) bulbs with three different filament arrangements are investigated in detail. The average junction temperature, temperature of the surface of the bulb, and luminous flux of three samples all increased with increasing power. The thermal performance test results show that between the average junction, temperature and power were linear. The junction temperatures of the three samples at a power of 3.5 W were 102.48, 98.46, and 88.88 °C. The optical performance test results revealed that the luminous flux and efficiency in the two vertical filament arrangements were closely related to each other and higher than that of the horizontal filament arrangement. A numerical model of LED filament bulbs was established by the Floefd 17.2 software for analyzing the temperature distribution of the cross section and the gas flow path inside the bulb. The simulation results illustrated that the average temperatures of three samples were 105.88, 101.83, and 96.12 °C. Additionally, the gas flow inside the bulb of the two vertical filament arrangements was subject to forming a thermal cycle during operation work more than that of the horizontal filament arrangement. As a result, the flexible spiral LED filament bulb is feasible as a new light source. View Full-Text
Keywords: thermal; optical; filament arrangement; led filament bulb thermal; optical; filament arrangement; led filament bulb
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MDPI and ACS Style

Wang, W.; Zou, J.; Zheng, Q.; Li, Y.; Yang, B.; Shi, M.; Li, Y.; Li, X.; Zhang, C.; Li, C.; Chen, D. The Effect of Different Filament Arrangements on Thermal and Optical Performances of LED Bulbs. Appl. Sci. 2020, 10, 1373. https://doi.org/10.3390/app10041373

AMA Style

Wang W, Zou J, Zheng Q, Li Y, Yang B, Shi M, Li Y, Li X, Zhang C, Li C, Chen D. The Effect of Different Filament Arrangements on Thermal and Optical Performances of LED Bulbs. Applied Sciences. 2020; 10(4):1373. https://doi.org/10.3390/app10041373

Chicago/Turabian Style

Wang, Wei; Zou, Jun; Zheng, Qiaoyu; Li, Yuefeng; Yang, Bobo; Shi, Mingming; Li, Yang; Li, Xinyu; Zhang, Canyun; Li, Cao; Chen, Difei. 2020. "The Effect of Different Filament Arrangements on Thermal and Optical Performances of LED Bulbs" Appl. Sci. 10, no. 4: 1373. https://doi.org/10.3390/app10041373

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