Metrology for wearable light loggers and optical radiation dosimeters

Exposure to light has a profound effect on human wellbeing. Solar UV radiation is linked to an increased risk of skin cancer and research is ongoing into how artificial light can disrupt the ‘biological clock’ that regulates the timing and quality of sleep.

Whilst light levels can readily be studied in the laboratory, in real-world conditions wearable ‘light loggers’ are required. The data these produce can be affected by multiple factors including the type of sensors used, the model or the environment.

The standard CIE S 026 provides methods for assessing the effect of light on the eye however no framework or associated standards exist for the quantification of these devices - hindering research in this area. In addition, whilst standards such as EN 12464-1 describe light levels in buildings and workplaces, there are no recommendations for workplace exposure to solar UV, and well characterised devices are also needed to assess this.

This project will provide methods for evaluation, validation and traceability of light loggers and UV dosimeters which will be assessed via an intercomparison. Based on this, a good practice guide and a software platform will be produced to help harmonise data formats and improve the reproducibility of these instruments. New sensor technologies for light loggers will also be investigated to ensure the methods and recommendations developed remain applicable and do not easily become obsolete.

Results are anticipated to contribute to new or revised standards in this area – ultimately helping clinicians and researchers to better understand the adverse effects of UV and artificial light on human health.