TY - JOUR
T1 - Light Exposure during Days with Night, Outdoor, and Indoor Work
AU - Daugaard, Stine
AU - Markvart, Jakob
AU - Bonde, Jens Peter
AU - Christoffersen, Jens
AU - Garde, Anne Helene
AU - Hansen, Åse Marie
AU - Schlünssen, Vivi
AU - Vestergaard, Jesper Medom
AU - Vistisen, Helene Tilma
AU - Kolstad, Henrik Albert
N1 - © The Author(s) 2019. Published by Oxford University Press on behalf of the British Occupational Hygiene Society.
PY - 2019/7/1
Y1 - 2019/7/1
N2 - OBJECTIVE: To assess light exposure during days with indoor, outdoor, and night work and days off work.METHODS: Light intensity was continuously recorded for 7 days across the year among indoor (n = 170), outdoor (n = 151), and night workers (n = 188) in Denmark (55-56°N) equipped with a personal light recorder. White light intensity, duration above 80, 1000, and 2500 lux, and proportion of red, green, and blue light was depicted by time of the day and season for work days and days off work.RESULTS: Indoor workers' average light exposure only intermittently exceeded 1000 lux during daytime working hours in summer and never in winter. During daytime working hours, most outdoor workers exceeded 2500 lux in summer and 1000 lux in winter. Night workers spent on average 10-50 min >80 lux when working night shifts. During days off work, indoor and night workers were exposed to higher light intensities than during work days and few differences were seen between indoor, outdoor, and night workers. The spectral composition of light was similar for indoor, outdoor, and night workers during days at and off work.CONCLUSION: The night workers of this study were during night hours on average exposed for a limited time to light intensities expected to suppress melatonin. The indoor workers were exposed to light levels during daylight hours that may reduce general well-being and mood, especially in winter. Outdoor workers were during summer daylight hours exposed to light levels comparable to those used for the treatment of depression.
AB - OBJECTIVE: To assess light exposure during days with indoor, outdoor, and night work and days off work.METHODS: Light intensity was continuously recorded for 7 days across the year among indoor (n = 170), outdoor (n = 151), and night workers (n = 188) in Denmark (55-56°N) equipped with a personal light recorder. White light intensity, duration above 80, 1000, and 2500 lux, and proportion of red, green, and blue light was depicted by time of the day and season for work days and days off work.RESULTS: Indoor workers' average light exposure only intermittently exceeded 1000 lux during daytime working hours in summer and never in winter. During daytime working hours, most outdoor workers exceeded 2500 lux in summer and 1000 lux in winter. Night workers spent on average 10-50 min >80 lux when working night shifts. During days off work, indoor and night workers were exposed to higher light intensities than during work days and few differences were seen between indoor, outdoor, and night workers. The spectral composition of light was similar for indoor, outdoor, and night workers during days at and off work.CONCLUSION: The night workers of this study were during night hours on average exposed for a limited time to light intensities expected to suppress melatonin. The indoor workers were exposed to light levels during daylight hours that may reduce general well-being and mood, especially in winter. Outdoor workers were during summer daylight hours exposed to light levels comparable to those used for the treatment of depression.
U2 - 10.1093/annweh/wxy110
DO - 10.1093/annweh/wxy110
M3 - Journal article
C2 - 30865270
SN - 2398-7308
VL - 63
SP - 651
EP - 665
JO - Annals of Occupational Hygiene
JF - Annals of Occupational Hygiene
IS - 6
ER -