A review of spatial brightness metrics
Abstract submitted to CIE Australia Lighting Research Conference 2023
The amount of light in architectural lighting design and research is often quantified using photometric measures, such as illuminance and luminance. Photometric measures are calculated using the photopic luminous efficiency function based on 2-degree visual field of view. However, the original luminous efficiency function V(λ) underestimated sensitivity at short wavelengths, and recent studies identified statistical differences between luminous efficiency of radiation (LER) obtained from V(λ) and other updated versions [1], for example, V10(λ), VF,q,10(λ) and VF,q(λ) [2]. Despite the existing measure, the overwhelming use of V(λ) in lighting industry was not alleviated. In addition to the inaccuracies in the photopic luminous efficiency function, photometric measures are criticized for their inaccuracy in estimating perceived brightness of architectural spaces. Instead, an alternative concept (spatial brightness) has emerged to quantify scene brightness [4]. Spatial brightness is impacted by the visual field size [4], spectral power distribution (SPD) of the light source [5], correlated colour temperature (CCT) [6], the reflectance of surfaces [7], observer age [4] and other factors. New spatial brightness metrics and updated photometric measures calculated with alternative luminous efficiency functions have been proposed. Computational simulations suggest that there are significant differences between metrics between the original and alternative metrics [1]. However, the accuracy of the spatial brightness and alternative photometric measures should be systematically tested through visual experiments.
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Work Title | A review of spatial brightness metrics |
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License | In Copyright (Rights Reserved) |
Work Type | Other |
Publication Date | 2023 |
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Deposited | March 26, 2024 |
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