Metrics like daylight autonomy and UDI are especially useful when trying to predict energy savings based on daylight analysis, and analyzing the effectiveness of daylight at a particular workspace.This does depend on the material properties at the analysis point. When trying to avoid glare, usually measure the differences in the light reflecting off of a surface (luminance values in cd/m2, or another glare metric like DGP).
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This does not depend on the material properties at the analysis point. When determining light levels for tasks in a building, measure the light falling onto the surface (illuminance, measured in lux or footcandles).Good daylight comes from the sky, not the sun directly.See more information on the Measuring Light page. Daylight optimization and the design processīefore you can effectively use the daylighting values reported in the software, it’s important to know what the numbers represent.The decision tree below can guide you to the right metrics and tools. There are many ways to measure and visualize light, and you may use different tools depending on which question you’re trying to answer. Is light well distributed and not causing glare?.How much can you offset artificial lights with daylight?.Can you get enough light for specific tasks?.
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