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    Area of Science:

    • Environmental Science
    • Lighting Technology
    • Human-Computer Interaction

    Background:

    • Human environments increasingly blend natural and artificial light sources.
    • Previous research identified consistent chromatic variations in natural light across seasons, time of day, and weather.
    • Understanding indoor light is crucial for optimizing human well-being and visual perception in built spaces.

    Purpose of the Study:

    • To quantify the light characteristics within a mixed-illuminant office environment.
    • To compare the statistical regularities of indoor light with those found in natural scenes.
    • To investigate the contribution of different light sources (daylight, artificial light) to indoor light properties.

    Main Methods:

    • Light measurements were taken in a typical office located in the Northern Hemisphere (51.76°N, -1.27°W).
    • Data analysis focused on chromatic variations and statistical regularities within the measured indoor light.
    • The study considered light entering through specific windows and reflecting off interior surfaces.

    Main Results:

    • The study found that indoor office light exhibits chromatic regularities similar to naturalistic scenes.
    • These regularities were predominantly influenced by daylight entering through east- and north-facing windows and subsequent surface reflections.
    • Directly imaged light through the north-facing window contributed less to these observed regularities.

    Conclusions:

    • Mixed-illuminant built environments, like offices, can replicate statistical light regularities found in nature.
    • Daylight, even when filtered and reflected, plays a significant role in establishing these naturalistic light patterns indoors.
    • This research provides valuable data for designing indoor environments with more natural light qualities.