Impacts of dynamic LED lighting on the well-being and experience of office occupants

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Summary

Dynamic LED lighting with varying illuminance and CCT throughout the day significantly increased afternoon alertness compared to static conditions, suggesting a practical tool for combating midday sleepiness in offices. However, dynamic lighting also significantly reduced perceived sleep quality and sleep duration at night, indicating that careful design of dimming/CCT schedules is necessary to avoid circadian disruption.

Key Findings

Significant increase in afternoon alertness observed under dynamic lighting conditions compared to static lighting (p < 0.05 implied by 'significant').
Dynamic lighting was associated with a significant decrease in perceived sleep quality and sleep time at night.
Marginal (non-significant) benefit for mood was observed under dynamic lighting.
No significant differences found for mental stress, productivity, visual comfort, or perceived naturalness across lighting conditions.
Study involved 15 participants working across 3 office modules over 4 months with 4 lighting conditions (2 static, 2 dynamic).

Categories

Workplace Performance: Dynamic lighting conditions were tested for effects on alertness, productivity, mood, and visual comfort in an office living-lab setting.

Sleep & Circadian Health: The study measured nighttime sleep quality and sleep duration as outcomes of daytime dynamic lighting exposure.

Mood & Mental Wellness: Mood and mental stress were assessed as psychological outcomes across static and dynamic lighting conditions.