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| daylight |
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All direct, diffused, reflected and refracted light from the sun in daytime. |
| daylighting |
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The choice, art, science or practice of using daylight as the primary daytime light source in a room or building. |
| illuminance |
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Used to describe brightness, or the concentration of light striking a surface. Measured in Lux. |
| luminance |
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Used to describe glare: this is always directional, & depends on position of observer and light source. Various techniques & units are used to describe glare. |
| daylight factor |
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The illuminance at a point expressed as a % of the simultaneous illuminance under an overcast sky. |
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