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. 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 seven 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.

中文翻译：

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用于测量个人光照和活动水平的三种实用现场设备的比较

本文记录了两个新版本 Daysimeter 的光谱和空间性能特征，这是由照明研究中心开发和校准的设备，用于测量和记录个人昼夜节律曝光和活动水平，并将它们与 Actiwatch Spectrum 的那些进行比较。Daysimeter 和 Actiwatch Spectrum 的光度误差也被确定为各种类型的光源。Daysimeters 具有比 Actiwatch Spectrum 更好的光度性能。为了评估与测量身体不同部位的光线和活动水平相关的差异，老年人连续 7 天佩戴四个 Daysimeter 和一个 Actiwatch Spectrum。