We have used a light dosimeter during an entire year. Our objective s were to (1) test its routine use, (2) measure across all seasons, our "real life" exposure to light, as well as our day and night activity, and (3) characterize their variations. The dosimeter was the "LightWatcher" (LW) developed for the EUClock project. It measures UV, Blue, Green, Red and Infrared spectral irradiances as well as activity and temperature. We wore it on an eyeglass frame during the day and on the wrist during the night. We logged our activities. In this paper, we describe the LW sensors and qualify their measurements. We describe how the data was processed. We illustrate some of the first results by showing the difference in light exposure between working days and NOT workings days. We provide feedback on LW use and suggest improvements.
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