Presentacion 15 Abril 2012 (1)

7/31/2019 Presentacion 15 Abril 2012 (1)

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LED street lighting: modeling and design

Ivan Moreno, and Alejandra Bugarin

Univ. Autonoma de Zacatecas

Mexicoemail: [email protected]

Photonics Europe 2012


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Abstract

We present a simplified theoretical platform for LED street-lightingmanagement, which may be a practical guide toward high performanceoptical designs.

For example, we derive an equation for the ideal radiation pattern of theLED luminaire that achieves both perfect optical efficiency and perfectillumination uniformity on several practical scenarios.



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Advantages of LED lighting

Longlifetime

Fastresponse

High controlability

High efficiency

Compactness


LongLifetime


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Glare

Non-uniform

Upward reflectedlight

Light pollution

Wasting energy

Non-uniform illumination

Light pollution

Wasting energy

glare


Weakness of traditional street light


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Traditional street light LED street light

higher glare non-uniform light pattern serious light pollution a lot of wasting energy

lower glare uniform light pattern lower light pollution a few of wasting energy


Efficient light distribution


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1. Montecarlo Ray Tracing. Accurate analysis technique for LEDstreet lighting.

2. Photometric Theory. Practical and simplein far-field LED streetlighting.


Models for LED street lighting


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There is a wide variety of spatial emission profiles of LEDs for streetlighting that use special optics.


Types of radiation patterns

LEDs available in the market Recent LED designs


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Example of Radiation Pattern Model

Horizontal plane Vertical plane

Model of Intensity Distribution

where


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The Model allows Rapid Simulations


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The ideal shape of pattern may be obtained

A. Pachamanov, D. Pachamanova, Optimization of the light distribution of luminaries fortunnel and street lighting, Engineering Optimization, 40, 47-65 (2008).

W. Lai, W. Chen, X Liu, X Lei, Optimal design of light distribution of LED luminaries forroad lighting, Proc. Of SPIE Vol. 8123, 81231P (2011).


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Ideal Angular Distribution: central

Ideal illuminance patternIdeal

A market LED


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Ideal Angular Distribution: Corner

Ideal illuminance pattern Ideal

IdealIdeal illuminance pattern

One Lamp

Two Lamps


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Abstract

We introduced a simplified theoretical platform for spatial distribution of LEDstreet light, which is intended to be a practical guide toward highperformance optical designs.

We reported an equation to represent the radiation pattern of new LEDluminaires, which are designed to achieve both high optical efficiency andillumination uniformity.



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LED No LED

Thanks!

Presentacion 15 Abril 2012 (1)

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