Optical design of a road lighting luminaire using a chip-on-board LED array

Ge, Aiming; Shu, Hongyun; Chen, D; Cai, Jiajun; Chen, J; Zhu, Ling

doi:10.1177/1477153515627480

Cited by 8 publications

(10 citation statements)

References 7 publications

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“…For C 3 , the T8/T5 fluorescent tubes are used to replace T12/T10 fluorescent tubes. The emerging LED lamps were not covered, however, it promotes to each of the above cluster (Pan, 2018;Wang, 2017;Asolkar and Dr., 2017;Xie et al, 2016;Ge et al, 2016;Edirisinghe et al, 2016). Here the LED lamps were allocated proportionally based on the proportions of the lighting electricity consumption of C 1 , C 2 , and C 3 .…”

Section: Estimation Of Coal-saving Induced By the Glpmentioning

confidence: 99%

Impact of the Green Light Program on haze pollution in the North China Plain, China

Long

Tie

Zhou

et al. 2019

Preprint

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Abstract. As the world's largest developing country, China undergoes the ever-increasing demand for electricity during the past few decades. In 1996, China launched the Green Lights Program (GLP), which becomes a national energy conservation activity for saving lighting electricity, as well as an effective reduction of the coal consumption for power generation. Despite of the great success of the GLP, its effects on haze pollution have not been investigated and well understood. This study focused to assess the potential coal-saving induced by the GLP and to estimate the consequent improvements of the haze pollutions in the North China Plain (NCP), because severe haze pollutions often occur in the NCP and a large amount of power plants locate in this region. The estimated potential coal-saving induced by the GLP can reach a massive value of 120&#8211;323 million tons, accounting for 6.7&#8211;18.0&#8201;% of the total coal consumption for thermal power generation in China. In December 2015, there was a massive potential emission reduction of air pollutants from thermal power generation in the NCP, which was estimated to be 20.0&#8211;53.8&#8201;Gg for NOx and 6.9&#8211;18.7&#8201;Gg for SO2. The potential emission reductions induced by the GLP played important roles in the haze formation, because the NOx and SO2 are important precursors for the formation of particles. To assess the impact of the GLP on haze pollution, sensitive studies were conducted by applying a regional chemical/dynamical model (WRF-CHEM). The model results suggest that in the lower limit case of emission reduction, the PM2.5 concentration decreases by 2&#8211;5&#8201;&#181;g&#8201;m&#8722;3 in large areas of the NCP. In the upper limit case of emission reduction, there was much more remarkable decrease in PM2.5 concentration (4&#8211;10&#8201;&#181;g&#8201;m&#8722;3). This study is a good example to illustrate that scientific innovation can induce important benefits on environment issues, such as haze pollution.

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Section: Estimation Of Coal-saving Induced By the Glpmentioning

confidence: 99%

Impact of the Green Light Program on haze pollution in the North China Plain, China

Long

Tie

Zhou

et al. 2019

Preprint

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“…LEDs have been commonly used in automotive low beam and high beam headlamps, 11–15 but there are very few papers on FFLs. Chen et al.…”

Section: Introductionmentioning

confidence: 99%

“…As a new type of light source, LEDs have the advantages of a small size and a long life, which can greatly improve the quality and effectiveness of vehicle lighting. [7][8][9][10] LEDs have been commonly used in automotive low beam and high beam headlamps, [11][12][13][14][15] but there are very few papers on FFLs. Chen et al 16 designed a new type of grating lens, which was simulated in raytracing software and 3D modelling software.…”

Section: Introductionmentioning

confidence: 99%

Design of a high-efficiency system with combined reflectors for a light-emitting diode front fog lamp

Yang

Liu

et al. 2020

Lighting Research & Technology

Self Cite

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This paper provides a design method for a light-emitting diode front fog lamp system based on a freeform surface and an improved quadric surface. First, a light-receiving reflector is used to converge the light-emitting diode beam to form an equivalent lighting point. Then, the relationship between the point and the light pattern on the work surface is calculated, and the freeform surface is constructed based on Snell’s law and non-imaging optical theory. Finally, two compensated reflectors are added at both ends of the freeform surface to reflect the unutilized light to achieve the compensation effect. By application of combined reflectors, the light pattern at the work surface 25 m away can satisfy the requirement of ECE R19 Revision 7. Also, this system has the advantages of small size and high efficiency because lens or prism groups are avoided. And the utilization of a compensated surface also increases light efficiency. Finally, a prototype model is tested, which also meets the regulatory requirements.

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“…This causes construction problems connected with the need to dissipate heat from a small surface, which is a serious issue for thermal system producers and constructors [30,31]. Moreover, the size of COB LED results in the need to use special, dedicated optical system constructions [32,33]. According to the latest research, limiting the Tj junction temperature is of key importance to the life of light-emitting diodes [34].…”

Section: Introductionmentioning

confidence: 99%

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

Czyżewski

2019

Crystals

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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.

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Optical design of a road lighting luminaire using a chip-on-board LED array

Cited by 8 publications

References 7 publications

Impact of the Green Light Program on haze pollution in the North China Plain, China

Impact of the Green Light Program on haze pollution in the North China Plain, China

Design of a high-efficiency system with combined reflectors for a light-emitting diode front fog lamp

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

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