Open AccessDynamic white lighting to aid sleep and vision for persons living with dementia using off-the-shelf LED strips
Author(s) -
Long Bao Le,
Aien Charity Grace White,
A.J. Chaudhari,
Nafia AL-Mutawaly,
Janette Elaine White,
Wai-Keung Lee,
YehLiang Hsu,
James White
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.443050
Subject(s) - melatonin , illuminance , evening , optics , sleep (system call) , morning , night vision , dementia , color vision , white light , optometry , medicine , computer science , physics , disease , astronomy , operating system
Alzheimer disease and related dementias affect 15-20% of elderly people, and 60-70% of these suffer from sleep disturbances. Studies suggest that lighting can improve sleep. The key challenge is how to deliver light effectively. We have designed a lighting system that adjusts spectrum and irradiance on a 24-hour timetable to provide spatially uniform, shadow-free white light with CRI>85 and up to 1000 Lux for day vision and amber light for night vision. To aid sleep, melanopic illuminance varies over 3 orders of magnitude to enable strong suppression of melatonin in the morning/early afternoon, moderate suppression in the evening, and no suppression at night.