Blue-enriched white light in the workplace improves self-reported alertness, performance and sleep quality

Blue-Enriched Lighting for Older People Living in Care Homes: Effect on Activity, Actigraphic Sleep, Mood and Alertness

“…It should be noted that in the current study participants were not forced to be exposed to the experimental lights during the mood and alertness assessments thus the well-known acute effect of lighting on mood and alertness [18; 19; 22; 25; 27; 66; 71], may not have been captured. The subjective mood and sleep questionnaires used in the current study may also have been too blunt an instrument to discriminate small changes in mood, alertness and sleep quality in this older study population, although changes were seen in office workers [27], and in a population of nursing home residents with [38] and without dementia [72]. In the former study, however, care givers evaluated the participants' mood and behaviour, whereas in the current study participants responded themselves which may well account for the discrepant results.…”

“…Blue-enriched polychromatic light has now been tested in a number of settings [27][28][29][30], but caution should be applied to the findings, as in some cases, such as the study of older people reported here, the effects appear small and mixed. Based on this work it is important to further characterise the risks and benefits of 17000 K blue-enriched light prior to this lighting being applied permanently in care homes for older people.…”

“…This blue-light sensitivity has led to the recent development and testing of both blue light and blue-enriched polychromatic light in a variety of populations [27][28][29][30].…”

What Keeps Us Awake?—the Role of Clocks and Hourglasses, Light, and Melatonin

“…In a recent field study (Viola et al, 2008), the effects of exposure to blue-enriched white light (17,000 K) were investigated in comparison to another white light (4000 K) during daytime work hours in an office setting. Blue-enriched white light substantially improved subjective measures of alertness, mood, performance, evening fatigue, concentration, and dramatically reduced daytime sleepiness (Fig.…”

La lumière comme stimulant de l’activité cognitive cérébrale

“…Modifier ces éclairages pourrait avoir des effets très bénéfiques. Il a été rapporté, par exemple, qu'une fois enrichi en bleu, l'environnement lumineux améliore la perception subjective de la performance au travail et de la qualité du sommeil, ainsi que l'humeur [30]. Comme autre exemple, augmenter l'intensité lumineuse dans les institutions pour patients âgés souffrants de démence ralentit la progression des symptômes, augmente l'activité le jour et la diminue la nuit, et améliore donc potentiellement la qualité du sommeil (un facteur important dans la difficulté de la prise en charge et l'activité nocturne des patients) [31].…”