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Light distribution on surfaces

Light distribution on surfaces

Technically, luminance thoroughly describes the visual scene and should be the primary design metric. The problem is, luminance is not easily measured and calculations are complex and time consuming. Because luminance depends on the reflectance of the surface, it is highly dependent on exact knowledge of architectural and interior finishes. Most footcandle-based standards are simplified approximations of true luminance-based design and analysis. Luminance should be considered as part of the design. As a basic premise, IES design criteria suggest that wall and ceiling luminance be close to task luminance, the range being dependent upon application. The luminance of the task background—typically white paper—should be used as the basis and room surfaces should not exceed a 10:1 luminance ratio.

Different Light Distribution

Distribution & Spaces Figure 1. Photometrically-accurate computer renderings of the same office using different luminaires. Although each office provides the same average illuminance on the desk, the ceiling and wall luminances vary dramatically. Images courtesy of Leslie M. North.

http://algonline.org/docs/index.php?light-distribution-on-surfaces

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Light distribution on surfaces | Technilux Lighting

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Light distribution on surfaces | Technilux Lighting

Properly designed, it can cost up to 5 to 10 dollars per square foot. Place sufficient of them on a south-dealing with roof and they're going to considerably cut back a home's electrical demand. The greatest advantage of using clay and concrete tiles is that they are quite durable, require very low maintenance and can be used to construct moderate to steeper sloped roofs; albeit with reinforced roof framing support that can bear their weight since they are both quite heavy.

Light distribution on surfaces | Technilux Lighting

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Light distribution on surfaces | Technilux Lighting

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Light distribution on surfaces | Technilux Lighting

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Light distribution on surfaces | Technilux Lighting

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Light distribution on surfaces | Technilux Lighting

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Light distribution on surfaces | Technilux Lighting

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Light distribution on surfaces | Technilux Lighting

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