A Study on the Subjective Response for Corrected Colour Temperature Conditions in a Specific Space

Byoung-Chul, Park; Chang, Jiang; Kim, Yu-Sin; Jeong, Jae-Weon; Choi, An-Seop

doi:10.1177/1420326x10383472

Cited by 43 publications

(46 citation statements)

References 17 publications

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“…Our postulation was that, as respondents felt more co mfortable under CW L, they typed significantly faster than WWL (least co mfortable perceived). The finding was supported by finding fro m another research by Park et al (2010), where their work performance under CW L condition was shown to be higher than WWL.…”

Section: Visual Comfort and Subjective Preferences Assessmentsupporting

confidence: 80%

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Effects of Light’s Colour Temperatures on Visual Comfort Level, Task Performances, and Alertness among Students

Shamsul¹,

Sia²,

Ng³

et al. 2013

AJPHR

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Introduction: Correlated colour temperatures (CCT) of the light source in indoor environment plays an imperative role in addressing both psychological and physiological functions of the occupant. As one of the determinants of lighting quality, CCT are off particular importance which affects quality of work and in classroom learning. Objective: The aim of this study is to determine the effects of warm white light (WWL) (CCT = 3,000K), cool white light (CWL) (CCT = 4,000K) and artificial daylight (DL) (CCT=6,500K) on the performances, subjective alertness level, visual comfort level and preferences of student in Faculty of Medicine and Health Sciences, Universiti Putra Malaysia. Methodology: A laboratory controlled experiment was conducted on total of 47 undergraduate students volunteered to participate in a series of test under three coloured light sources. 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 conducted. Result: Significant increase was observed in subjective alertness level (p=0.041) and computer-based performances (p=0.001) under DL condition in relative to WWL condition. In terms of typing performances, respondents performed significantly better in term of typing speed under CWL than DL and WWL. Least typing errors were made under DL, followed by CWL and WWL. CWL is the most preferred (p=0.001) and most comfortable (p=0.011) CCT environment where subjects indicated the ability to perform task longer in this coloured-lit environment. Conclusion: The study concludes that the CWL and DL were more beneficial for alertness level and academically activities for both computer-based and paper-based activities.

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Section: Visual Comfort and Subjective Preferences Assessmentsupporting

confidence: 80%

“…However, few studies found contradicting conclusion where 3,000K light source was comfo rtable and high CCT (17,000K) lead to dizziness (Park et al, 2010;Gó rnicka, 2008).…”

Section: Visual Comfort and Subjective Preferences Assessmentmentioning

confidence: 99%

Effects of Light’s Colour Temperatures on Visual Comfort Level, Task Performances, and Alertness among Students

Shamsul¹,

Sia²,

Ng³

et al. 2013

AJPHR

View full text Add to dashboard Cite

show abstract

“…Such a design may unpremeditatedly help to reveal the influence of other contextual factors on colour preference, since it relatively weakens the impact of light when compared to the conditions where CCT differs. However, unlike colour fidelity, colour preference should not be restricted by a reference light source, since in many cases people actually want to choose a favorite light irrespective of the CCT 4,26,[33][34][35][36][37] . Secondly, the experimental object is also an important concern.…”

Section: Introductionmentioning

confidence: 99%

Light dominates colour preference when correlated colour temperature differs

Huang

Liu

Westland

et al. 2017

Lighting Research & Technology

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Colour preference of lighting is generally influenced by three kinds of contextual factors, which are the features of light, object and observer. In this study, a series of psychophysical experiments were conducted to investigate and compare the effect of certain factors on colour preference, including spectral power distribution of light, lighting application, observers' personal colour preference, regional cultural difference and gender difference. Certain LED lights with different correlated colour temperatures were used to illuminate a wide selection of objects. Participant response was quantified by a 7-point rating method or a 5-level ranking method. It was found that the preferred illumination for different objects exhibited a similar trend and the influence of light was significantly stronger than that of other factors. Therefore, we conclude that the light itself (rather than, for example, the objects that are viewed) is the most crucial factor for predicting which light, among several candidates with different CCTs, an observer will prefer. In addition, some of the gamut-based colour quality metrics correlated well with the participants' response, which corroborates the viewpoint that colour preference is strongly influenced by colour saturation. Moreover, the familiarity of the object affects the ratings for each experiment while the colour of the objects also influences colour preference.

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“…The luminous environment in a space is one of the key factors affecting the occupants’ work performance and mood . Current concerns about sustainability may lead to a reduction in illuminance levels in office light; in the commercial sector, lighting accounts for up to 40% of energy costs in a typical UK office .…”

Section: Learning Productivity and Alertness In Indoor Spacesmentioning

confidence: 99%

A review of the effects of colour and light on non‐image function in humans

2017

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This paper reviews the non-image forming aspect of vision. Developments in the last twenty years have seen the discovery of a fifth class of human visual pigment (melanopsin) in addition to the three classes of photopsins in the cones and rhodopsin in the rods. Melanopsin is found in a small number of retinal ganglion cells which then, in addition to receiving input from the rods and cones, are intrinsically photosensitive. These intrinsically photosensitive retinal ganglion cells send their input primarily to the hypothalamus where they help to regulate the circadian system (daily rhythms of sleeping patterns, body temperature, heart rate etc.). The discovery of the anatomical basis of non-image forming vision has led to a great deal of research into the effects of light on sleep, depression and mood, retinal photodamage, and wellbeing, amongst other topics. Given the recent technological innovations in LED lighting that now give us greater control over our environmental lighting it is timely to review the nonvisual effects of light on humans to inform lighting design in the future.3

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A Study on the Subjective Response for Corrected Colour Temperature Conditions in a Specific Space

Cited by 43 publications

References 17 publications

Effects of Light’s Colour Temperatures on Visual Comfort Level, Task Performances, and Alertness among Students

Effects of Light’s Colour Temperatures on Visual Comfort Level, Task Performances, and Alertness among Students

Light dominates colour preference when correlated colour temperature differs

A review of the effects of colour and light on non‐image function in humans

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