LED Luminaires: Many Chips—Many Photometric and Lighting Simulation Issues to Solve

Skarżyński, Krzysztof; Żagan, W.; Krajewski, Kamil

doi:10.3390/en14154646

Cited by 8 publications

(4 citation statements)

References 38 publications

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“…The distance from which the photometric inverse square law is met is referred to as the Photometric Test Distance. This procedure is used for complex optical systems and multi-source LED luminaires [29].…”

Section: Introduction 1photometric Measurementsmentioning

confidence: 99%

The Influence of a Photometric Distance on Luminance Measurements

Czyżewski

2023

Energies

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Luminance measurements are the least frequent of all photometric measurements. This article characterizes and systematizes the various methods of luminance measurement. In particular, the method of direct luminance measurement using modern luminance meters (ILMD) is described in detail. This paper presents the results of the study on the influence of the measurement distance on the luminance measurement results. Two ILMD meters (laboratory and portable) and a luminance standard were used in this study. The conducted research showed that an incorrectly chosen measuring distance can lead to significant measurement errors of up to several tens of percent. In addition, the possible impact of incorrect measurements on the design of an interior lighting installation was presented. It was shown that the selected interior lighting installation can consume more than 40 percent more electricity compared to the installation based on the correct luminance measurements of the luminaires with diffuse shades. In the final stage of the study, the definition of the photometric test distance for luminance measurements using ILMD was proposed. The test results can be particularly useful for the luminance measurements of OLEDs or the luminaires with diffuse luminous character. However, these results can also be used for luminance measurements of other light sources and luminaires.

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Section: Introduction 1photometric Measurementsmentioning

confidence: 99%

The Influence of a Photometric Distance on Luminance Measurements

Czyżewski

2023

Energies

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“…Currently, floodlighting should be considered as implementing lighting designs whose main value is to obtain an esthetic effect of extraordinary beauty [28,29]. Computer software enabling the creation of such visualization is so advanced that is possible to render reality with even photorealistic accuracy [13,[30][31][32][33][34]. Due to the use of computer visualization of lighting, it is possible to save time that earlier was consumed in field trials.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Assessment of Architectural Lighting Designs

Skarżyński

Żagan

2022

Sustainability

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There has recently been a great interest in the outdoor lighting that is energy-efficient and does not intensify a light pollution phenomenon. In architectural lighting, these demands are difficult to implement and rarely analyzed. However, it is possible to introduce and use certain parameters based on the utilization factor for the quantitative assessment of floodlighting design in terms of both light pollution and energy efficiency. This paper presents the definitions of new parameters and the results of their calculations for several typical architectural objects. Different lighting concepts were created for each object together with appropriate computer simulations. The research shows a high potential for usefulness of new parameters in the design process. The floodlighting utilization factor is characterized by relatively low values of around 35%. In addition, obtaining the recommended lighting power density value below 2.2 W/m2 does not sufficiently determine the correctness of the design implementation considering the natural environment. This determines a great potential for opportunities to improve the implemented designs and provides a basis for redefining the currently used approach in architectural lighting. In order to create high-quality, sustainable solutions, all quantitative parameters should be analyzed simultaneously in addition to the esthetic visual effect issue.

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“…In the literature, there have been several attempts to describe the photometric distance including the far-field description covered in the International Commission on Illumination (CIE) report [71]. However, conducting a laboratory test is recommended to determine the measuring distance properly [72]. At the same time, the In this method, for the measurement to be correct, the distance between the light source and the detector should be such that the photometric distance law can be applied.…”

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confidence: 99%

The Photometric Test Distance in Luminance Measurement of Light-Emitting Diodes in Road Lighting

Czyżewski

2023

Energies

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Over the last few years, light-emitting diodes have completely dominated the lighting field. In road lighting, high-power LEDs have replaced traditional light sources. That is why various technical aspects of LEDs have been researched extensively worldwide. However, little research has been conducted in the area of luminance measurement. This paper reviews the methods for measuring the luminance of high-power LEDs. Particular attention is paid to the influence of the measurement distance on the measurement results. Next, the results of the tests using a modern image luminance measuring device (ILMD) for luminance measurements are presented. It is concluded that it is necessary to redefine the photometric test distance. The conducted research demonstrates that an incorrectly selected test distance can lead to the huge errors of several hundred per cent or more. In addition, the possible impact of the incorrect measurements on the design of road lighting installations is presented. It is shown that a road lighting installation can use over 300% more electrical energy compared to the installation based on the correct luminance measurements of single LEDs. In the final stage of the research, the definition of the photometric test distance for LED measurements using ILMD is proposed. The results of the research can also be useful for the luminance measurements of other types of LEDs.

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LED Luminaires: Many Chips—Many Photometric and Lighting Simulation Issues to Solve

Cited by 8 publications

References 38 publications

The Influence of a Photometric Distance on Luminance Measurements

The Influence of a Photometric Distance on Luminance Measurements

Quantitative Assessment of Architectural Lighting Designs

The Photometric Test Distance in Luminance Measurement of Light-Emitting Diodes in Road Lighting

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