Light & Engineering 27 (1)

Volume 27
Date of publication 02/20/2019
Pages 38–45

A Pilot Study Assessing Short-Term Chromatic Adaptation Preferences for Correlated Colour Temperature in India. L&E 27 (№1. 2019)

Articles authors:

Amardeep M. Dugar, Dashak Agarwal

Amardeep M. Dugar, Ph.D., is a trained architect and founding principal of Lighting Research & Design. After completing a Masters degree in Architectural Lighting from University of Wismar/Germany, he pursued a Ph.D. from Victoria University of Wellington/New Zealand to solidify his academic and professional leadership role into a career at a higher level

Dashak Agarwal, M.D. is a founding partner of Thea Light Works, a total enterprise architectural lighting company in India. He completed his Bachelors degree in Logistics Management from Fisher College of Business at The Ohio State University/USA and Masters Degree in Architectural Lighting from the University of Wismar/Germany

Abstract

This small-scale pilot study investigates peoples’ shortterm chromatic adaptation preferences for correlated colour temperature (CCT) within the cultural context of India. White tone CCT preferences were investigated using a spectrally tuneable LED lighting system. A mock-up room was built and illuminated with two LED luminaires. Each LED luminaire has 216 clusters and each cluster comprising three LED with CCT equal respectively to 3000 K, 4000 K and 6500 K (total 648 LEDs per luminaire). User preference studies in a generic environment were conducted with 50 Indian subjects, where each subject performed generic everyday activities, such as reading, watching TV, eating and relaxing, while being totally immersed in three different scenes of 3000 K, 4000 K and 6500 K. The study shows 6500 K is the least preferred CCT, and 4000 K is preferred for task-oriented activities such as reading and eating. Furthermore, subjects are unable to differentiate between 3000 K and 4000 K while performing non-task-oriented activities such as relaxing and watching TV.

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Keywords

DOI: https://doi.org/10.33383/2017-062