Performance characterisations were carried out before and after a modification to the optics of the Condor Instruments’ ActTrust light and activity data loggers to improve the spectral performance for measuring melanopic-weighted irradiance in non-visual studies. The results confirm the intended improvement, so that the device provides the best-known single-sensor match to the melanopic response. In addition, the device includes a separate sensor which remained well-matched for illuminance logging.
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References
1.
Commission Internationale de l’Eclairage. CIE TN 003:2015. On The 1st International Workshop on Circadian and Neurophysiological Photometry, 2013. Vienna: CIE, 2014.
2.
LucasRJPeirsonSNBersonDMBrownTMCooperHMCzeislerCAFigueiroMGGamlinPDLockleySWO’HaganJBPriceLLAProvencioISkeneDJBrainardGC. Measuring and using light in the melanopsin age. Trends in Neurosciences2014; 37: 1–9.
3.
PriceLLAKhazovaMO’HaganJB. Performance assessment of commercial circadian personal exposure devices. Lighting Research and Technology2012; 44: 17–26.
4.
FigueiroMGHamnerRBiermanAReaMS. Comparisons of three practical field devices used to measure personal light exposures and activity levels. Lighting Research and Technology2013; 45: 421–434.
5.
HubalekSZöschgDSchierzC. Ambulant recording of light for vision and non-visual biological effects. Lighting Research and Technology2006; 38: 314–321.
6.
HankinsMWPeirsonSNFosterRG. Melanopsin: an exciting photopigment. Trends in Neurosciences2008; 31: 27–36.
7.
BelloneGJPlanoSACardinaliDPChadaDPVogoDEGolombekDA. Comparative analysis of actigraphy performance in healthy young subjects. Sleep Science2016; 9: 272–279.
8.
EneziJRevellVBrownTWynneJSchlangenLLucasRJ. A ‘melanopic’ spectral efficiency function predicts the sensitivity of melanopsin photoreceptors to polychromatic lights. Journal of Biological Rhythms2011; 26: 314–323.
9.
PriceLLA. On the role of exponential smoothing in circadian dosimetry. Photochemistry and Photobiology2014; 90: 1184–1192.
Gall DI, Bieske KA. Definition and measurement of circadian radiometric quantities. In: Proceedings of the CIE Symposium ’04 on Light and Health: Non-visual Effects, 2004, 30 September–2 October 2004: pp. 129–132. Vienna: School of Music and Performing Arts.
18.
International Standards Organization. ISO/CIE 19476:2014: Joint ISO/CIE Standard: Characterization of the Performance of Illuminance Meters and Luminance Meters, Geneva: ISO, 2014.
19.
Van DerlofskeJBiermanAReaMRamanathJBulloughJ. Design and optimization of a retinal flux density meter. Measurement Science and Technology2002; 13: 821–828.
20.
ZeitzerJMDijkD-JKronauerREBrownENCzeislerCA. Sensitivity of the human circadian pacemaker to nocturnal light: melatonin phase resetting and suppression. Journal of Physiology2000; 526: 695–702.
