A proposal for a simplified model to evaluate the circadian effects of light sources

Bellia, Laura; Seraceni, M

doi:10.1177/1477153513490715

Cited by 29 publications

(31 citation statements)

References 38 publications

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“…These functions vary in terms of their framework and their relative consideration of retinal neurophysiology. 18,[21][22][23][24][25][26] Research to date has primarily focused on the spectral sensitivity of the human circadian system, but it should be noted that exposure duration also has an impact on the amount of light needed to stimulate the circadian system. Early studies by McIntyre et al 27,28 showed that increasing light levels lead to increased melatonin suppression and required shorter durations of exposure for observing significant suppression.…”

Section: Introductionmentioning

confidence: 99%

Effect of exposure duration and light spectra on nighttime melatonin suppression in adolescents and adults

Nagare

Plitnick

Figueiro

2018

Lighting Research & Technology

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This study investigated how light exposure duration affects melatonin suppression, a wellestablished marker of circadian phase, and whether adolescents (13-18 years) are more sensitive to short-wavelength (blue) light than adults (32-51 years). Twenty-four participants (12 adolescents, 12 adults) were exposed to three lighting conditions during successive 4-h study nights that were separated by at least one week. In addition to a dim light (<5 lux) control, participants were exposed to two light spectra (warm (2700 K) and cool (5600 K)) delivering a circadian stimulus of 0.25 at eye level. Repeated measures analysis of variance revealed a significant main effect of exposure duration, indicating that a longer duration exposure suppressed melatonin to a greater degree. The analysis further revealed a significant main effect of spectrum and a significant interaction between spectrum and participant age. For the adolescents, but not the adults, melatonin suppression was significantly greater after exposure to the 5600 K intervention (43%) compared to the 2700 K intervention (29%), suggesting an increased sensitivity to shortwavelength radiation. These results will be used to extend the model of human circadian phototransduction to incorporate factors such as exposure duration and participant age to better predict effective circadian stimulus.

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Section: Introductionmentioning

confidence: 99%

Effect of exposure duration and light spectra on nighttime melatonin suppression in adolescents and adults

Nagare

Plitnick

Figueiro

2018

Lighting Research & Technology

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“…Bellia`s method declares an excellent match for light sources with correlated color temperature (CCT) from 2500 K to 6500 K and blackbody radiator (color temperature CT from 1000 K to 10 000 K) with Rea`s model [14]. This modification may be very important for consequent research in nonvisual light impact on humans.…”

Section: The Methods For Circadian Response Evaluation According To Bementioning

confidence: 99%

“…Previous experiments mentioned, that not only ipRGC controls the circadian response, but also other photoreceptorsthe rods and cones [13]. Latest researches stated that data from Brainard and Thapan acquired with monochromatic light sources may be inappropriate, because the effect of b-z opposite channel is not included [14]. Brainard and Thapan`s data at around 500 nm are irregular, and the fitting curve shows a discontinuity point.…”

Section: Computational Model For Circadian Responsementioning

confidence: 99%

Circadian Characteristics of Special Glazing

Hartman¹,

Šujanová²,

Hraška³

2014

AJS

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“…Other figures of merit for the circadian system have been reported such as circadian light value [23][24][25] (CL A ) and melatonin suppression index 26 (MSI) to evaluate the circadian potential of light sources. The MSI shows the potential spectral impact of a lamp SPD on the melatonin suppression.…”

Section: Caf Blm Lmmentioning

confidence: 99%

Healthy, natural, efficient and tunable lighting: four-package white LEDs for optimizing the circadian effect, color quality and vision performance

2014

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To date, most current reports on the development and optimization of artificial lighting sources have focused on the energy performance levels and limited color qualities of white light-emitting diodes (LEDs). However, these properties are insufficient in terms of representing all performance levels required when adjusting white LEDs for healthy and smart lighting. Here, we introduce essential and advanced figures of merit pertaining to circadian performance as well as vision performance and color quality. We compare all possible properties of commercialized artificial lighting, daylight and four-package white LEDs which consist of long-wavelength pass dichroic filter (LPDF)-capped, phosphor-converted red, amber and green LEDs (pc-LEDs) and a blue LED. We show that these tunable four-package white LEDs produce a tunable circadian effect for melatonin suppression/secretion, a high color quality for color perception/reproduction, high efficiency for energy savings and tunable figures of merit for the smart LED lighting market.

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A proposal for a simplified model to evaluate the circadian effects of light sources

Cited by 29 publications

References 38 publications

Effect of exposure duration and light spectra on nighttime melatonin suppression in adolescents and adults

Effect of exposure duration and light spectra on nighttime melatonin suppression in adolescents and adults

Circadian Characteristics of Special Glazing

Healthy, natural, efficient and tunable lighting: four-package white LEDs for optimizing the circadian effect, color quality and vision performance

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