ArticleScientific reports2019
Awakening effects of blue-enriched morning light exposure on university students' physiological and subjective responses.
Article in Scientific reports, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 24 papers, 2 of them syntheses that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
24 citing papers in PubMed, 2 syntheses or guidelines pooled it.
- Pooled it
- Pooled it
- Different light color temperatures in the morning on the effectiveness of rehabilitation training in patients with ischemic stroke: a prospective, single-center, randomized controlled clinical trial.Journal of neuroengineering and rehabilitation · 2025Trial
- Improving children's alertness and neuromuscular response by using a blue-enriched white light in the kindergarten playroom.Scientific reports · 2025Trial
- Randomised trial reveals a mismatch between preferences for and hormonal responses to anthropogenic light colour temperatures.PloS one · 2025Trial
- Real-World Effects of Melanopic-Enhanced Classroom Lighting on Sleep, Mood, and Cognition in Male Korean Adolescents: A Field-Based Pilot Study.Clocks & sleep · 2026Article
- Naturalight: A controlled illuminated environment to study light exposure impact on behavior and cognition in freely moving rats.HardwareX · 2025Article
- Influence of lighting on sleep behaviour, circadian rhythm and spontaneous blink rate in stabled riding school horses (Equus caballus).PloS one · 2025Article
- Personal light treatment devices: a countermeasure to improve sleep, fatigue, and circadian misalignment in an operational setting.Sleep advances : a journal of the Sleep Research Society · 2025Article
- Application of circadian rhythm in osteoporosis prevention and treatment: from light, diet, and exercise to chronotherapy.Frontiers in endocrinology · 2025Review
- Study on the change of miners' psychological state under different illuminance levels.Heliyon · 2024Article
- Light wavelength modulates search behavior performance in zebrafish.Scientific reports · 2024Article
- Evaluation of the effects of blue-enriched white light on cognitive performance, arousal, and overall appreciation of lighting.Frontiers in public health · 2024Article
- Blue Light Filtration in Intraocular Lenses: Effects on Visual Function and Systemic Health.Clinical ophthalmology (Auckland, N.Z.) · 2024Review
- Development and Verification of a 480 nm Blue Light Enhanced/Reduced Human-Centric LED for Light-Induced Melatonin Concentration Control.ACS omega · 2023Article
- The Influence of Light Wavelength on Human HPA Axis Rhythms: A Systematic Review.Life (Basel, Switzerland) · 2023Review
- Two-photon absorption behavior of conjugated oligomers suitable for low colour temperature LEDs.RSC advances · 2023Article
- Article
- Alerting effects of light in healthy individuals: a systematic review and meta-analysis.Neural regeneration research · 2022Review
- Influence of Light Phase Exposure to LED Lighting on Circadian Levels of Neuroendocrine Hormones in Sprague-Dawley Rats.Journal of the American Association for Laboratory Animal Science : JAALAS · 2022Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
We investigated physiological and subjective responses to morning light exposure of commercially available LED lighting with different correlated colour temperatures to predict how LED-based smart lighting employed in future learning environments will impact students. The classical markers of the circadian system (melatonin and cortisol), as well as the subjective perception of sleepiness, mood, and visual comfort, were compared. Fifteen university students underwent an hour of morning light exposure to both warm (3,500 K) and blue-enriched (6,500 K) white lights at recommended illuminance levels for classrooms and lecture halls (500 lux). The decline of melatonin levels was significantly greater after the exposure to blue-enriched white light. Exposure to blue-enriched white light significantly improved subjective perception of alertness, mood, and visual comfort. With regard to cortisol, we did not find a significant difference in the cortisol decrement between the two light conditions. Our findings suggest that the sensitivity of physiological and subjective responses to white LED light is blue-shifted. These findings, extending the already known effects of short-wavelength light on human physiology, reveal interesting practical implications. Blue-enriched LED light seems to be a simple yet effective potential countermeasure for morning drowsiness and dozing off in class, particularly in schools with insufficient daylight.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.