Performance assessment of commercial circadian personal exposure devices
Abstract
Through the influence on circadian rhythms, natural and artificial lighting, as well as lifestyle and architecture, affect health and performance. Epidemiological and interventional studies of light-initiated circadian biological outcomes require robust 24‐hour data on personal light exposures, including blue light weighted irradiance data. The performance of the detection systems used is a key factor. We assessed the performance of 16 Actiwatch Spectrum™ devices for spectral response, directional response and dynamic range and propose techniques for calibration, deployment and data analysis for use of the watches in circadian studies. The results are presented, followed by a discussion of applicability focussing on spectral response for circadian studies.
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Actiwatch light measurements are typically inaccurate at lower light intensities.
“Actiwatch light measurements are typically inaccurate at lower light intensities [see the Supplementary Materials and (11, 12)].”
From Sleepmore in Seattle: Later school start times are associated with more sleep and better performance in high school students (2018) · cites this paper as [12]
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- Authors
- Price, L., Khazova, M., & O'Hagan, J.
- Affiliations
- Health Protection Agency (GB)
- Laser and Optical Radiation Dosimetry Group, Health Protection Agency, Didcot, Oxfordshire, UK
- ORCID
- Khazova, M
- Venue
- Lighting Research & Technology
- Publisher
- SAGE Publications
- Published
- 2012-01-11
- Volume
- 44
- Issue
- 1
- Pages
- 17-26
- ISSN
- 0024-3426 (ISSN-L)
- 1477-1535
- 1477-0938
- OpenAlex
- W2155804169
- Cited by
- 53
- References
- 15
- Citations by year
- 2026: 6 · 2025: 4 · 2024: 2 · 2023: 4 · 2022: 2 · 2021: 9 · 2020: 2 · 2019: 8 · 2018: 3 · 2017: 5 · 2015: 4 · 2014: 2 · 2012: 2
- FWCI
- 1.13
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Lighting Research & Technology (publishedVersion)
- Funders
- National Institute for Health and Care Research
- National Institutes of Health
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Physical Sciences › Environmental Science › Global and Planetary Change › Impact of Light on Environment and Health
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
- Keywords
- personal light exposure, spectral response, directional response, dynamic range, device calibration, circadian rhythm
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