Effects of light's colour temperatures on visual comfort level, task performances, and alertness among UPM's students

Chai, Sia Chee (2012) Effects of light's colour temperatures on visual comfort level, task performances, and alertness among UPM's students. [Project Paper] (Submitted)

Text fpsk4 2012 46-.pdf Download (31MB)

Abstract

Summary: Introduction: As one of the determinants of lighting quality, the correlated colour temperatures (CCT) of light source plays role in both psychological and physiological needs. Influences of different light's CCT are to be tested and studied among undergraduate students of UPM, Malaysia. Objective: The aim of this study is to determine the effects of warm white (WW) light (CCT=3000K), cool white (CW) light (CCT=4000K) and artificial daylight (DL) (CCT=6500K) on students' performances, subjective alertness level, visual comfort level and preferences. Methodology: A controlled experiment was conducted on total of 47 volunteer undergraduate students under three coloured light sources in a windowless room. FrACT software was used to assess visual task performance, modified OLS questionnaire was used to evaluate subjective comfort level and preferences, typing test and KSS alertness level monitoring was performed. Result: The results showed that there were significant increases of subjective alertness level (p=O.041) and computer-based performances (p=O.OOl) under DL condition in relative to WW condition. In term of typing performances, subjects performed significantly better in term of typing speed under CW light than DL and WW light. Least typing errors were made under DL, followed by CW light and WW light. CW is the most preferred (p=O.OOl) and most comfortable (p=O.Oll) colour for subjects, and subjects indicated that they can perform longer works in this coloured-lit environment. Conclusion: The study concludes that the CW light and DL light were more beneficial for alertness level and academically activities including both computer-based and paper¬based activities. KEYWORDS: Lighting, correlated colour temperatures, visual comfort, alertness level, visual task performance.

Item Type:	Project Paper
Faculty:	Faculty of Medicine and Health Science
Depositing User:	Ms Norafizah Radzuan
Date Deposited:	22 Nov 2022 06:25
Last Modified:	25 Aug 2023 03:34
URI:	http://psaspb.upm.edu.my/id/eprint/190

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