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

Anne Teupner; Krister Bergenek; Ralph Wirth; Juan C. Miñano; Pablo Benítez

doi:10.1117/12.2043545

27 February 2014 Merit function for the evaluation of color uniformity in the far field of LED spot lights

Anne Teupner, Krister Bergenek, Ralph Wirth, Juan C. Miñano, Pablo Benítez

Proceedings Volume 9003, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVIII; 900303 (2014) https://doi.org/10.1117/12.2043545
Event: SPIE OPTO, 2014, San Francisco, California, United States

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 U_sl. 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.

Citation Download Citation

Anne Teupner, Krister Bergenek, Ralph Wirth, Juan C. Miñano, and Pablo Benítez "Merit function for the evaluation of color uniformity in the far field of LED spot lights", Proc. SPIE 9003, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVIII, 900303 (27 February 2014); https://doi.org/10.1117/12.2043545

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