Design and demonstration of high efficiency anti-glare LED luminaires for indoor lighting

Chiang, Che Wen; Hsu, Yu Kai; Pan, Jui-Wen

doi:10.1364/oe.23.000a15

Cited by 18 publications

(5 citation statements)

References 15 publications

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“…11 Chiang et al proposed an optical design for reducing the effect of glare and the multi-shadow by anti-glare lens array and diffuser sheet. 12 Although the addition of the diffuser has provided convenience for researches, most of the diffusers applied in research have not been optical designed, which causes the defects in design. In our previous work, the design of DFSs has been relatively mature.…”

Section: Introductionmentioning

confidence: 99%

Design method of diffuse transmission free-form surface combined with collimation lens array

Zhu

Wang

Zhang

2020

Lighting Research & Technology

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Lighting-emitting diodes are widely applied in lighting systems, and diffusers are commonly used in systems for indirect illumination. In this paper, a design method of diffuse transmission free-form surface combined with collimation lens array is proposed. Based on the Lambertian characteristics of lighting-emitting diodes and the principle of collimation lenses, a mathematical model of diffuser with ideal diffuse transmission free-form surface is established. We propose a method of the preset collimation surface to connect the free-form surface and the collimation lens array, and derive the nonlinear algebraic equation of the diffuse transmission free-form surface according to the connection effect of the preset collimation surface. Then, solving the equation numerically by MATLAB, the profile of the diffuse transmission free-form surface is obtained. Finally, the non-sequential ray tracing software TracePro is used to simulate the irradiance distribution of the target plane. The results show better uniformity and higher efficiency comparing with the lighting system using diffuse transmission free-form surface alone and the traditional diffuse transmission lighting system.

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Section: Introductionmentioning

confidence: 99%

Design method of diffuse transmission free-form surface combined with collimation lens array

Zhu

Wang

Zhang

2020

Lighting Research & Technology

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“…They have changed how people think about general lighting design and application and provided important solutions for energy saving and environmental protection today and in the future [1][2][3][4][5][6][7]. Therefore, energy saving and humanization in lighting have attracted much attention.…”

Section: Introductionmentioning

confidence: 99%

Establishment and Solution for a Mathematical Model of Multiple Diffuse Reflection

Zhu

Sun

et al. 2020

IEEE Photonics J.

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The indirect illumination system with diffuse reflection light-emitting diode (LED) is widely applied in various fields that require high illumination uniformity. On the basis of the Lambertian characteristic of LEDs and the ideal diffuse surface, a design method that features a multiple diffuse reflectance freeform surface is proposed and its related mathematical model is established in this paper. A nonlinear algebraic equation is solved to redistribute the energy emitted by the LED to a uniformity illuminated scene. The outline of the diffuse surface is obtained by solving equations numerically. With the use of the ray tracing software TracePro, simulation results show that the effect is generally the best and the uniformity and efficiency are significantly improved compared with other methods when the proportion between the radius of the target surface and the distance between the LED light source and the target surface is 1:4.

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“…These technologies often require modification of the native LED die or involve multiple, complex fabrication steps. Conventional optics such as lenses or mirrors can also control the divergence and intensity distribution of LED beams but due to their nonplanar, bulky geometries hinder the integration of these miniature light sources into optical systems and devices.…”

Section: Introductionmentioning

confidence: 99%

Shaping LED Beams with Radially Distributed Waveguide‐Encoded Lattices

Lin

Benincasa

Fradin

et al. 2019

Advanced Optical Materials

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and in this way, enhance the external quantum efficiency (EQE) of emission. Because of the breadth and diversity of LED applications-and the consequent need for greater light coverage, better collimation, controllable divergence and ability to direct light to specific directions-there have been extensive efforts to shape, design, and systematically modulate their characteristically Lambertian beam profiles. Approaches range from microlenses or microprismatic facets, [9][10][11][12] photonic crystals [13][14][15] to nanorod arrays and nanospheres; [16,17] various radiation patterns such as a uniform intensity distribution, [10,18] batwings, [19,20] or beams with small divergence [11,12] have been achieved. These technologies often require modification of the native LED die or involve multiple, complex fabrication steps. Conventional optics such as lenses or mirrors [21,22] can also control the divergence and intensity distribution of LED beams but due to their nonplanar, bulky geometries hinder the integration of these miniature light sources into optical systems and devices. Here we show that LED beams can be modulated by a single component, plane-faced, slim polymer film embedded with a radial distribution of cylindrical waveguides. The radially distributed waveguide-encoded lattice (RDWEL) [23] is slim (≤2 mm) and flexible, rendering it suitable as a conformal coating that both protects and optically manipulates LED emission. Importantly, such coatings could be integrated without significantly disrupting mature LED fabrication technologies. The RDWEL is fabricated through a single-step, roomtemperature self-inscription method developed in our group, which exploits the spontaneous self-trapping [24,25] of large populations of incandescent beams in photopolymerizable acrylate [26][27][28] and epoxide [23,29] fluids. Each self-trapped beam elicited in these systems inscribes a multimoded, cylindrical waveguide capable of guiding all visible wavelengths of light. As a result, the RDWEL is operable with broadband light spanning the entire visible wavelength range. However, the focus of the current work is to demonstrate the manipulation of light from commercially available, narrowband LEDs by the RDWEL structure.Akin to the arthropodal compound eye, the RDWEL possesses an enhanced and seamless field of view (FOV). [23] As a result, a noncollimated LED beam incident on the RDWEL

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Design and demonstration of high efficiency anti-glare LED luminaires for indoor lighting

Cited by 18 publications

References 15 publications

Design method of diffuse transmission free-form surface combined with collimation lens array

Design method of diffuse transmission free-form surface combined with collimation lens array

Establishment and Solution for a Mathematical Model of Multiple Diffuse Reflection

Shaping LED Beams with Radially Distributed Waveguide‐Encoded Lattices

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