Abstract

Detailed insights in both visual effects of light and effects beyond vision due to manipulations in illuminance and correlated color temperature (CCT) are needed to optimize study protocols as well as to design light scenarios for practical applications. This study investigated temporal dynamics and interindividual variability in subjective evaluations of sensation, comfort and mood as well as subjective and objective measures of alertness, arousal and thermoregulation following abrupt transitions in illuminance and CCT in a mild cold environment. The results revealed that effects could be uniquely attributed to changes in illuminance or CCT. No interaction effects of illuminance and CCT were found for any of these markers. Responses to the abrupt transitions in illuminance and CCT always occurred immediately and exclusively amongst the subjective measures. Most of these responses diminished over time within the 45-minute light manipulation. In this period, no responses were found for objective measures of vigilance, arousal or thermoregulation. Significant interindividual variability occurred only in the visual comfort evaluation in response to changes in the intensity of the light. The results indicate that the design of dynamic light scenarios aimed to enhance human alertness and vitality requires tailoring to the individual to create visually comfortable environments.

Highlights

  • The light in our direct surroundings affects us in more ways than many of us are aware of, and has implications for what we see, how we behave and how we feel

  • None of the other outcome parameters that were included in this study showed statistically significant interindividual variability in their responses to changes in illuminance or correlated color temperature (CCT), indicating similar responses to light for the relatively homogenous sample that was included in this study

  • We demonstrated that abrupt transitions in illuminance and/or CCT led to different temporal response dynamics for subjectively evaluated appraisal, mood and alertness

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Summary

Introduction

The light in our direct surroundings affects us in more ways than many of us are aware of, and has implications for what we see, how we behave and how we feel.

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