Anti-glare LED lamps with adjustable illumination light field

Chen, Yung‐Sheng; Lin, Chung-Yi; Yeh, Chun-Ming; Kuo, Chie‐Tong; Hsu, Chih-Wei; Wang, Hsiang‐Chen

doi:10.1364/oe.22.005183

Cited by 21 publications

(7 citation statements)

References 12 publications

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“…Hence, we created a reflector from a conic curve in a rotationally symmetric way. The conic surface graph shows that each curve has a corresponding focus and different curved surfaces can be determined by the sag equation [24][25][26], which is shown in Equation (1). A conic constant comparison table of each conic curve has been provided by [24].…”

Section: Design Concept Of the Reflectormentioning

confidence: 99%

Laser Headlamp with a Tunable Light Field

Tseng

Chen

et al. 2019

Energies

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This study developed an optical module for laser headlamps with a tunable light field. Laser headlamps have high and low beam lighting functions that are applied by changing the numbers of unit headlamps. For regulatory validation, we validated the project in accordance with the Regulation No. 112 of the Economic Commission for Europe (ECE) to determine whether the results meet the regulatory requirements or not. The proposed design increased the lighting distance by 2.14 times and decreased the size of the mechanism by 45% relative to the values for LED headlamps. High and low beam lighting functions were provided by the same laser sources.

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Section: Design Concept Of the Reflectormentioning

confidence: 99%

Laser Headlamp with a Tunable Light Field

Tseng

Chen

et al. 2019

Energies

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“…In recent years there has been a strong effort for making lighting design [1][2][3][4] and corresponding lighting systems [5][6][7][8] sustainable and environmentally friendly [9] either by selecting efficient luminaires [10,11], lighting controls [12][13][14][15], or embodying more efficient lighting design [16][17][18] or daylight [19][20][21][22][23]. The importance of avoiding light pollution (LP) has gained interest in technical reports [24,25] and expert discussions [26] only in the last few years.…”

Section: Introductionmentioning

confidence: 99%

Identifying, Examining, and Planning Areas Protected from Light Pollution. The Case Study of Planning the First National Dark Sky Park in Greece

Papalambrou

Doulos

2019

Sustainability

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Light pollution is a type of pollution that climaxes in cities and occurs increasingly away from them, due to the increase of artificial lighting and inappropriate lighting design (selection of luminaires, aiming, illuminance/luminance levels, and spectral characteristics). Increasingly, light pollution also affects the countryside due to local lighting but also distant lighting propagating from urban areas. This has a significant impact on ecosystems and astronomical observing sites. This work analyzes the main facts about light pollution (causes, impact, and solutions) and studies the methods, parameters, and special requirements for planning of light pollution protected areas. This dark sky park planning methodology is implemented as a case study in mount Parnon which has been selected due to its significance as a Natura 2000 protected area and because it is Greece’s most popular astronomical observing site. Mount Parnon is located close to two major cities as well as significant highways, however the site itself remains dark due to its sparse population. Planning a dark sky park involves a complete study of facts regarding the specific site. Existing lighting installations are surveyed in detail by recording types of luminaires and lamps and recording their positions in a map. Lighting illuminance levels are measured by photometers and spectra are analyzed using a spectrometer. Sky brightness levels measurements are performed using specialized photometers and light pollution origins are traced using wide-field photography. Finally, a proposal is made for a dark sky park scheme suited to the specific case of the site.

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“…The primary problem encountered in hollow light guides is uniformity. Researchers have attempted to resolve this problem by using a second lens to modulate the luminous intensity of LEDs [8], using multicolored LEDs with micro-lens arrays [9][10][11][12][13], using LEDs with the anodic aluminum oxide structure [14], and using multiple LEDs with various angles of emission toward a reflector [15]. Moreover, researchers have attempted to enhance the uniformity of diffusion plates to avoid partial reflection and transmission of light [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Hollow Light Guide Module Involving Mini Light-Emitting Diodes for Asymmetric Luminous Planar Illuminators

Chen

et al. 2019

Energies

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Light-emitting diodes (LEDs) have numerous advantages. However, LEDs only offer a point light source. Therefore, transforming LEDs into planar light sources is a new objective in general lighting applications. Solid light guides have strong uniformity but are marred by their material absorption characteristics and weight. Hollow light guides constitute a solution to the weight problem but exhibit poor uniformity and necessitate sacrificing efficiency to enhance uniformity. To resolve the uniformity, weight, and efficiency problems simultaneously, we propose a hollow light guide architecture involving mini-LEDs with asymmetric luminous intensity. To develop this guide module, we first optimized the aspect ratio of the cavity and then modulated the light path by using varied angles of the reflection surface on the end wall of the module. We then designed a beveled reflection surface near the mini-LEDs to further enhance uniformity. An archetype of the proposed architecture for planar light source modules had a width and depth of 51.5 and 9.95 mm, respectively. Experimental results revealed a total efficiency of 83.9% and uniformity of 92.3%. The module weight was determined to be 215 g, which was 40% lighter than that of similarly sized solid light guide modules.

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Anti-glare LED lamps with adjustable illumination light field

Cited by 21 publications

References 12 publications

Laser Headlamp with a Tunable Light Field

Laser Headlamp with a Tunable Light Field

Identifying, Examining, and Planning Areas Protected from Light Pollution. The Case Study of Planning the First National Dark Sky Park in Greece

Hollow Light Guide Module Involving Mini Light-Emitting Diodes for Asymmetric Luminous Planar Illuminators

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