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Updated: Jul 20, 2026

Measuring Light-Switching Behavior Using an Occupancy and Light Data Logger
Published on: January 16, 2020
The utility of a data-logging device for measuring adherence to home phototherapy
Christopher B Yelverton1, Rajesh Balkrishnan, Steven R Feldman
1Department of Dermatology, Wake Forest University School of Medicine, Winston Salem, NC 27157-1071, USA.
Background:
Treatment adherence to home phototherapy is not well characterized.
Purpose:
To develop an accurate measure of home phototherapy unit usage.
Methods:
We tested a commercially available data logger containing a photo-sensor on two home phototherapy units.
Results:
The data logger accurately recorded actual usage and did not record stray light sources over the study period.
Conclusion:
A data logger can accurately capture usage patterns for a home phototherapy unit. These devices could potentially be used in clinical trials to measure adherence to home phototherapy treatment regimens.

