An algorithm to minimise the beam angle of compound parabolic concentrators with LED sources

Liu, F; Chen, L; Hu, Yi; Lin, Qiang; Tang, Bin

doi:10.1177/1477153512471364

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…Current studies of LED luminaires indicate that their glare effect is significantly different than the one produced by conventional technologies lamps "because of their non-uniform luminance distribution with alternating areas of high and low luminance" and conventional glare measurement indices, such as the UGR (Unified Glare Rating) of the CIE (International Comission on Illumination), are not appropriate for this latest type of light sources [19]. Thus, Liu and others [20] indicate that the most appropriate solution to avoid glare with this technology is to act with an outer diffuse optical cover to improve the lighting performance.…”

Section: Analysis Of Glare In Public Lightingmentioning

confidence: 99%

Evaluation of Uniformity and Glare Improvement with Low Energy Efficiency Losses in Street Lighting LED Luminaires Using Laser-Sintered Polyamide-Based Diffuse Covers

et al. 2018

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Energy saving in street lighting is garnering more interest and has become a priority in municipal management. Therefore, LED luminaires are gradually becoming prevalent in our cities. Beyond their energy/economic saving potential, quality in public lighting installations concerns aspects such as uniformity and glare which must be maintained if not improved in any installation renewal project using this technology. The high light intensity generated in a discrete point in LED packages and its directional nature result in significant deficiencies in these last two parameters. To soften these effects, translucent covers are being used as one of the most common solutions with the drawback of significant light intensity losses. The objective of this paper is to evaluate the behavior of LED luminaire's polyamide-based optical covers manufactured with a laser-sintered process. These are designed to improve glare and uniformity output, to minimize light output reductions, and to be industrially manufactured with no increment of cost for their lighting equipment compared to conventional transparent polycarbonate solutions. A laboratory and field lighting test study has been applied to different covers with the same LED lamp and luminaire to compare the performance of three different solutions built with different polymeric materials and with different light transmission surface textures. The photometric results have been observed and discussed to demonstrate the ability to significantly improve the lighting performance of LED luminaires-illuminance and uniformity levels and discomfort and disability glare indexes-using an improved optic cover.

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Section: Analysis Of Glare In Public Lightingmentioning

confidence: 99%

Evaluation of Uniformity and Glare Improvement with Low Energy Efficiency Losses in Street Lighting LED Luminaires Using Laser-Sintered Polyamide-Based Diffuse Covers

et al. 2018

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The Implementation and Design of a Multi-Reflector Cup for LED Lighting

Chou

Gao

2016

GSTF J Eng Technol

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In recent years, the luminous efficacy of light emitting diodes (LEDs) has met energy conservation requirements. However, in lighting applications, lighting instruments must be appropriately applied to illuminate regions of interest. In this study, the LED AR111 downlight was used as an example to limit beam areas within a preset illuminating range. The TRIZ method was applied to generate ideas for product design concepts. We proposed installing replaceable gratings on LED lighting instruments, three types of multi-reflector cups that can be installed at various angles were designed for use in lighting instruments, and designed multi-reflector cups within gratings based on compound parabolic concentrator principles for calculating various beam angles, thereby improving the distribution of luminous intensity by using secondary optics. The 3D model and optical simulation showed that multi-reflector cups effectively controlled beam angles, satisfied various types of applications for illuminated objects, and enabled the effective utilization of light beams. By manufacturing a lighting instrument and measuring the distribution of luminous intensity, we ascertained that the use of multi-reflector cups in lighting instruments effectively prevented glare. Moreover, replacing the multi-reflector cups for use at different angles enabled the illuminated object to receive favorable lighting. The component was verified to satisfy design requirements.

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An algorithm to minimise the beam angle of compound parabolic concentrators with LED sources

Cited by 2 publications

References 10 publications

Evaluation of Uniformity and Glare Improvement with Low Energy Efficiency Losses in Street Lighting LED Luminaires Using Laser-Sintered Polyamide-Based Diffuse Covers

Evaluation of Uniformity and Glare Improvement with Low Energy Efficiency Losses in Street Lighting LED Luminaires Using Laser-Sintered Polyamide-Based Diffuse Covers

The Implementation and Design of a Multi-Reflector Cup for LED Lighting

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