Comparisons of Three Practical Field Devices Used to Measure Personal Light Exposures and Activity Levels

Overview

Journal Light Res Technol

Date 2014 Jan 21

PMID 24443644

Citations 60

Authors

M G Figueiro

R Hamner

A Bierman

M S Rea

Affiliations

Soon will be listed here.

Abstract

This paper documents the spectral and spatial performance characteristics of two new versions of the Daysimeter, devices developed and calibrated by the Lighting Research Center to measure and record personal circadian light exposure and activity levels, and compares them to those of the Actiwatch Spectrum (Philips Healthcare). Photometric errors from the Daysimeters and the Actiwatch Spectrum were also determined for various types of light sources. The Daysimeters had better photometric performance than the Actiwatch Spectrum. To assess differences associated with measuring light and activity levels at different locations on the body, older adults wore four Daysimeters and an Actiwatch Spectrum for five consecutive days. Wearing the Daysimeter or Actiwatch Spectrum on the wrist compromises accurate light measurements relative to locating a calibrated photosensor at the plane of the cornea.

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