Summary
This study benchmarks six HDR cameras for measuring luminance and melanopic radiance, finding substantial variation in accuracy depending on camera spectral responsivity and the luminance calculation model used. Lighting designers and researchers using HDR imaging for circadian-relevant metrics must carefully select both camera hardware and calculation methodology to minimize measurement error.
Key Findings
- Optimizing the luminance calculation model to limit spectral mismatch reduced luminance measurement error from 10.3% to 2.9%.
- Melanopic radiance measurement errors varied dramatically between cameras, ranging from 1.9% to 20.0%, depending on the camera's spectral responsivity.
- Correlated colour temperature (CCT) and full spectrum index of the light source were identified as key factors affecting measurement performance across all cameras.
Categories
The Science of Light: Directly evaluates HDR camera systems for measuring luminance and melanopic radiance across 205 spectral power distributions, relevant to circadian lighting measurement standards.
Author(s)
T Kruisselbrink
Publication Year
2020
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