Design of a Bicycle Head Lamp Using an Atypical White Light-Emitting Diode with Separate Dies

Lin, Hsin Jung; Sun, Ching Cherng; Wu, Chi; Lee, Xuan Hao; Yang, Tsan; Lin, Shih Kang; Lin, Yi; Yu, Yeh Wei

doi:10.3390/cryst9120659

Cited by 7 publications

(4 citation statements)

References 27 publications

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“…The smaller the etendue is, the sharper the cutoff line is. 27 Owing to the inherent scattering characteristic of the phosphor, the emitting surface of a pcW-LED looks like a Lambertian surface. 28 Therefore, etendue (U) is written as [29][30][31][32][33][34] E Q -T A R G E T ; t e m p : i n t r a l i n k -; e 0 0 1 ; 1 1 6 ; 1 4 4…”

Section: Characteristics Of Pcw-ledsmentioning

confidence: 99%

“…For the application to a bicycle headlamp, a 1-W pcW-LED is shown to meet the minimum requirement of the K-mark regulation. 27 To form a high-contrast cutoff line, there are various approaches related to using a reflector, including an L-shape light pipe and a truncated reflector with a cylindrical lens. 23 In addition, using a cylindrical lens array on the exit face of a headlamp is helpful for increasing the contrast of the cutoff line and decreasing the manufacturing error.…”

Section: Optical Design Approachesmentioning

confidence: 99%

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Review of optical design for vehicle forward lighting based on white LEDs

Sun

Lin

et al. 2021

Opt. Eng.

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We introduce a current development in optical design for vehicle forward lighting based on solid-state lighting, in particular, phosphor-converted white LEDs. The vehicles include bicycles, bikes, and automobiles. Although the requirements regulating different vehicles are different, the low beam always requires a high-contrast cutoff line. Three optical design approaches are discussed; these include a projection lens incorporated with a baffle or beam shaper, multisegment reflectors, and complex lenses. A new design approach called light field management technology for the multisegment reflector is introduced. In addition, the possible related manufacturing errors and the robustness of different optical approaches are analyzed. Finally, we introduce three approaches to adaptive forward lighting that provide a driver with brighter and clearer vision without inducing glare to people on the roadway. The application of video projection technology to roadway illumination could be a trend of vehicle forward lighting based on solid-state lighting. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Characteristics Of Pcw-ledsmentioning

confidence: 99%

Section: Optical Design Approachesmentioning

confidence: 99%

Review of optical design for vehicle forward lighting based on white LEDs

Sun

Lin

et al. 2021

Opt. Eng.

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“…In the method of comparing the 1-D light intensity, we use a power meter connected with a detector to measure light intensity by controlling the LED rotates around itself 181 degrees or the detector rotates around LED. Various studies achieved the precise optical model by applying this methodology [10][11][12] . However, the space between LED and detector must be large enough to conduct the rotation.…”

Section: Introductionmentioning

confidence: 99%

Light source modeling for UltraViolet-C Light-Emitting Diodes (UV-C LEDs) with aid of fluorescent film

Le¹,

Lin²,

Sun³

et al. 2022

Current Developments in Lens Design and Optical Engineering XXIII

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We perform the mid-field model of a UV-C LED with an arranged wavelength of around 275 nm by comparing the 2-dimension (2-D) gray-level image captured by a monochromatic CMOS and the corresponding simulated irradiance pattern. Owing to UV-C light, we propose using a fluorescent film to absorb UV-C light and re-emit light at a longer wavelength so that the 2-D gray level image can be captured. The calibration to approach the corrected gray level of image is presented. Consequently, we obtain the precise mid-field light source model. Moreover, the model is also applied for dome lens design and then compares the optical behavior with fabricated samples in measurement to evaluate its validity.

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“…Vehicle head lamps are crucial for traffic lighting to allow high visibility of the driver, pedestrians, and other people on the road. In the eleventh paper, Lin et al [11] present a design of a bicycle head lamp using a low-cost and atypical white light-emitting diode with separate dies. This is the first demonstration of a design for a bicycle head lamp using an atypical white LED with two separate dies.…”

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confidence: 99%

Advanced LED Solid-State Lighting Optics

Sun

Nguyen

2020

Crystals

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Light-emitting diodes (LEDs) have been intensively studied for white-light lighting since their luminous efficacy exceeds 50 lm/W. Currently, the luminous efficacy of an LED light tube/bulb is almost above 100 lm/W. LED solid-state lighting (SSL) has unequivocally become the major light source in general lighting. The fact of high efficiency and other advantages of LED SSL is enough to penetrate all lighting scenarios. However, what people demand from new-generation lighting is not only in energy efficiency but also in lighting quality. Thus, how to make the lighting more user friendly is one of the important issues, and, here, optics is the key point. For making a collection with the discussions of the novel optical design in enhancing lighting efficiency in a more uniform illumination pattern, in higher sharpness for special lighting, in a higher signal-to-noise ratio for communication, in more functions for new applications, etc., this Special Issue of “Advanced LED Solid-State Lighting Optics” focuses on advanced applications in all aspects.

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Design of a Bicycle Head Lamp Using an Atypical White Light-Emitting Diode with Separate Dies

Cited by 7 publications

References 27 publications

Review of optical design for vehicle forward lighting based on white LEDs

Review of optical design for vehicle forward lighting based on white LEDs

Light source modeling for UltraViolet-C Light-Emitting Diodes (UV-C LEDs) with aid of fluorescent film

Advanced LED Solid-State Lighting Optics

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