&lt;title&gt;New international recommendations on LED measurements&lt;/title&gt;

Muray, Kathleen

doi:10.1117/12.279226

Cited by 3 publications

(4 citation statements)

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“…These emerging applications require that the total luminous flux of LEDs should be measured as accurately as possible. There are two basic methods for measuring the total luminous flux: spatial resolved measurements using a goniophotometer or spatial integrated measurements using an integrating sphere [3][4][5]. The resolved method may be more accurate but it requires a complicated measurement facility and is rather time consuming [6,7].…”

Section: Introductionmentioning

confidence: 99%

A new spatial integration method for luminous flux determination of light-emitting diodes

Zhou¹,

Zhu²,

Shen³

et al. 2010

Meas. Sci. Technol.

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Spatial integrated measurement using an integrating sphere is usually used for the luminous flux determination of light sources. Devices using an integrating sphere are bulky for use on a production assembly line. This paper proposes an alternative spatial integration method for accurately measuring the total luminous flux of light-emitting diodes (LEDs) having no backward emission. A compound parabolic concentrator is introduced to collect the light from an LED in conjunction with a detector which in turn measures the luminous flux. The study reported here combines both modeling and experiment to show the applicability of this novel method. The uncertainty in the measurements is then evaluated for the total luminous flux measurement from an LED.

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Section: Introductionmentioning

confidence: 99%

A new spatial integration method for luminous flux determination of light-emitting diodes

Zhou¹,

Zhu²,

Shen³

et al. 2010

Meas. Sci. Technol.

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“…The measurement of the total luminous flux of light sources is generally done by one of two methods: goniophotometer or integrating sphere [1,2]. The measurement by a goniophotometer may be more accurate but more time consuming in operation than by an integrating sphere.…”

Section: Introductionmentioning

confidence: 99%

“…The demand is not easy to satisfy and thus causes error. The error is especially large for measuring blue LEDs [1].…”

Section: Introductionmentioning

confidence: 99%

Study on methodology of LED's luminous flux measurement with integrating sphere

Liu¹,

Zhou²,

Li³

et al. 2008

J. Phys. D: Appl. Phys.

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Errors are introduced when using traditional methods for measuring the total luminous flux of LEDs since an LED is quite different from traditional light sources in terms of physical size, flux level, spectrum and spatial distribution. This paper uses commercial lighting simulation software named Tracepro to simulate the self-absorption effect when using traditional integrating sphere methods to measure the total luminous flux of LEDs and then presents a modified method for the measurement. The LED under investigation or a specially designed narrow beam standard lamp is placed on the interior wall of the sphere in our method. The results show that the measurement method presented here can lead to better precision in the evaluation of the total luminous flux of LEDs.

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“…The luminous flux of the light source can be measured by means of a distributed photometer or integrating sphere [1,2]. Although the integral ball method is simple and the equipment is less, the self-absorption effect of the objects in the sphere is integrated, which makes the integrating sphere deviate from the ideal integrating sphere which leads to the test principle error and the measurement accuracy is not high.…”

Section: Introductionmentioning

confidence: 99%