Merit function for the evaluation of color uniformity in the far field of LED spot lights

Teupner, Anne and Bergenek, Krister and Wirth, Ralph and Miñano Dominguez, Juan Carlos and Benitez Gimenez, Pablo (2014). Merit function for the evaluation of color uniformity in the far field of LED spot lights. In: "Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVIII", 01/02/2014, San Francisco, California, EE.UU. pp. 1-8. https://doi.org/10.1117/12.2043545.

Description

Title: Merit function for the evaluation of color uniformity in the far field of LED spot lights
Author/s:
  • Teupner, Anne
  • Bergenek, Krister
  • Wirth, Ralph
  • Miñano Dominguez, Juan Carlos
  • Benitez Gimenez, Pablo
Item Type: Presentation at Congress or Conference (Article)
Event Title: Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVIII
Event Dates: 01/02/2014
Event Location: San Francisco, California, EE.UU
Title of Book: Proceedings of the SPIE
Título de Revista/Publicación: LIGHT-EMITTING DIODES: MATERIALS, DEVICES, AND APPLICATIONS FOR SOLID STATE LIGHTING XVIII
Date: 2014
ISSN: 0277-786X
Volume: 9003
Subjects:
Freetext Keywords: LED, color uniformity, color blending, optical systems,color perception
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Electrónica Física
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The scope of the present paper is the derivation of a merit function which predicts the visual perception of LED spot lights. The color uniformity level Usl is described by a linear regression function of the spatial color distribution in the far field. Hereby, the function is derived from four basic functions. They describe the color uniformity of spot lights through different features. The result is a reliable prediction for the perceived color uniformity in spot lights. A human factor experiment was performed to evaluate the visual preferences for colors and patterns. A perceived rank order was derived from the subjects’ answers and compared with the four basic functions. The correlation between the perceived rank order and the basic functions was calculated resulting in the definition of the merit function Usl. The application of this function is shown by a comparison of visual evaluations and measurements of LED retrofit spot lamps. The results enable a prediction of color uniformity levels of simulations and measurements concerning the visual perception. The function provides a possibility to evaluate the far field of spot lights without individual subjective judgment. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

More information

Item ID: 36075
DC Identifier: http://oa.upm.es/36075/
OAI Identifier: oai:oa.upm.es:36075
DOI: 10.1117/12.2043545
Deposited by: Memoria Investigacion
Deposited on: 29 Jul 2015 17:18
Last Modified: 29 Jul 2015 17:18
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