| Entry lighting indicates where the entry is, safely lights the way in and out of the building, and lights signs or building numbers. Less is more & Many are better than one - light levels and fixture placement. These seemingly contradictory principles applied to entryway lighting result in, inviting, uniform light levels. Use multiple low light level fixtures instead of one very bright fixture. If you use just one fixture, the area nearest it is too bright and the areas further away are too dim. Using multiple fixtures lets you put the light in the key areas of interest: near signs, by doorways and stairs, thus more evenly distributing the light. Light levels at the entry. Glare is caused either by direct view of an unshielded light source or by too much contrast if the rest of the exterior is relatively dark. A contrast ratio of less than 5 to 1 is desirable to softly accent an area without creating glare. When someone leaves an excessively lit building, it takes the eye longer to adapt from a bright entry to the darker walkways outside, making it difficult to see. Where does extra light go? In addition to causing visual difficulties, excessive light adds to other problems as well. All this extra light reflects off the surrounding walls and walkways, bouncing into the sky, creating "light pollution" (even concrete has a reflectance of up to 40%!). Light trespass invades adjacent buildings and light pollution reduces our ability to view the moon and stars, compromising our quality of life. |
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