Creating a desired lighting pattern with an LED array

Moreno, Iván

doi:10.1117/12.795673

Cited by 8 publications

(2 citation statements)

References 12 publications

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“…The back re ection of blue component was reduced due to high blue irradiance absorption but backward uorescence is still an issue for high non-radiative inside the LED junction which affects the life time of high brightness LED [13,[22][23][24]. Therefore, multiple small blue LEDs (MSB-LED) are being used to replace high brightness LED and it is currently a successful approach for higher e cacy illumination [25][26]. In MSB-LEDs system, the problem of backward uorescence is still a big issue which results in collective heating from each LED junction to the phosphor layer which is luminescent properties of phosphor, discoloration, decohesion, and cracking of the interface layer [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Remote phosphor-based extended white light source pumped by single blue LED for efficient lighting

Dubey

Trivedi

Kumar

et al. 2022

Preprint

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We report the development of an LED-based extended white light source containing a small cylindrical acrylic diffuser rod coated with YAG: Ce+3 phosphor and excited by a single 1W blue LED. This design supports remote phosphor coating technique and thermally isolates both LED as well as the phosphor layer. In this work, the blue light generated from GaN based LED chip was waveguided throughout the cylindrical diffuser and properly excited the phosphor layer for photoluminescence uniformity. The gradient diffusing technique was adopted for optimal light distribution of scattering and waveguiding of blue photons. The process dealt with both specular transmittance and bidirectional transmission distribution function (BTDF) of the diffuser so that the waveguided blue photons could propagate longer distance inside the diffuser rod via total internal reflection mechanism with simultaneous scattering due to gradient diffusing surface structure. The blue photons were found nearer to yellow phosphor behaved like an integrated chip-based system in remote phosphor structure. The scattering of blue photons was used in the photoluminescence process which was uniform throughout the diffuser length due to the selective diffusing technique. Because of this arrangement, the backward fluorescence and back-reflection of blue photons to the LED chip from phosphor layer were reduced significantly, resulting in the improvement of the source's luminance properties. The optical properties were properly analyzed, and it was found suitable for the use of general-purpose illumination-based applications.

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Section: Introductionmentioning

confidence: 99%

Remote phosphor-based extended white light source pumped by single blue LED for efficient lighting

Dubey

Trivedi

Kumar

et al. 2022

Preprint

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“…The problem of illumination rendering has been treated by Yang et al 5 and Moreno. 6 Linnartz et al 7 presented the idea of modulating LED illumination pulses using code division multiplexing as a way to facilitate determining individual illumination contributions at a receiver. Solutions based on frequency division multiplexing as a means to determine (and control) individual LED dimming levels have been treated by Yang et al 8,9 A framework for the design of lighting systems based on daylight control and occupancy information was developed by Singhvi et al 10 The approach used there considered the maximisation of occupant utility functions taking energy efficiency into consideration.…”

Section: Introductionmentioning

confidence: 99%

Occupancy-based illumination control of LED lighting systems

Caicedo

Pandharipande

Leus

2010

Lighting Research & Technology

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Light emitting diode (LED)-based systems are considered to be the future of lighting. We consider the problem of energy-efficient illumination control of such systems. Energy-efficient system design is based on two aspects: localised information on occupancy and optimisation of dimming levels of the LEDs. Specifically, we are interested in minimising the power consumption of an LED system, subject to providing uniform illumination at a pre-specified level around occupied zones, by determining the dimming levels of the LEDs. We show that this optimisation problem can be solved by linear programming and use the simplex algorithm to determine the dimming levels. The efficacy of our proposed system is evaluated in an office scenario by comparing it with a system that renders uniform illumination across the whole space.

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Output irradiance of tapered lightpipes

Moreno¹

2010

J. Opt. Soc. Am. A

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A light cone efficiently transports, distributes, and concentrates the incoming radiation. I derive a formula for the spatial irradiance (or illuminance) distribution at the exit aperture of a tapered light pipe. The theory is demonstrated by Monte Carlo ray-tracing for lightpipes with light-emitting diodes at the input face. The analysis is based on the addition of the radiation patterns of the multiple virtual sources that, as in a three-dimensional kaleidoscope, are seen through a tapered light tube. Given its explicit dependence on the structural and optical parameters, this analysis may be a useful tool in the development and application of light cones.

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Creating a desired lighting pattern with an LED array

Cited by 8 publications

References 12 publications

Remote phosphor-based extended white light source pumped by single blue LED for efficient lighting

Remote phosphor-based extended white light source pumped by single blue LED for efficient lighting

Occupancy-based illumination control of LED lighting systems

Output irradiance of tapered lightpipes

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