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Exposure to light profoundly influences human health, regulating circadian rhythms and impacting wakefulness and sleepiness. Estimating the effects of light under everyday conditions requires personal, wearable light logging and dosimetry approaches. This article introduces the MeLiDos Project (2023–), supported by the European Association of National Metrology Institutes (EURAMET). Its first branch defines quality indices and calibration standards for wearable light loggers, adapting to their smaller size and distinct purpose in the field rather than the laboratory. The second branch develops a software ecosystem, including the R-based software LightLogR, to manage the increasing volume of data, ensuring accessibility and interoperability. The third branch explores the potential of spatially resolved light dosimetry, examining the feasibility of capturing light exposure from various angles and spectral bands. The MeLiDos project anticipates advancements in wearable light metrology, paving the way for optimizing human health and well-being through wearable light logging technologies. Background: The importance of light for human health.
Spitschan et al. (Tue,) studied this question.