LIGHTING_Part_II - LIGHTING CHAPTER11:PartII...

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LIGHTING CHAPTER 11: Part II
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Artificial Light (Electric) Began with Thomas  Edison’s invention of the  light bulb Allows for total control  over brightness, color,  placement and quality Countless possibilities
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Planning Lighting Careful planning…. Analysis of needs,  Selection of lighting devices to meet these needs Fixture spacing and locations to achieve desired  lighting levels
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Planning Steps Define general goal  in terms of character/atmosphere of  space; depends on function and use Identify specific  purposes  for required lighting Determine intensity levels   for vision, balance this with energy; efficiency plays a  major role in determining lamp type and fixture location Select fixtures  based on specific needs Determine fixture placement ; very calculated process in  larger commercial projects
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Reflected Ceiling Plan “reflection” of the ceiling and what’s on it;  includes all fixtures and mechanical supply air  and return air grilles; any part of the ceiling that is  visible from within the space
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Lighting Needs 3 Categories Task Lighting-  for specific visual function (reading ,  writing, dressing, putting on make-up, using a computer;  also special purposes such as operating rooms, theaters,  art galleries) General (Ambient) Lighting-  overall light, comfortable  level of lighting, background light, avoids excessive  brightness and contrast Special Lighting-  generates variety of contrast, focuses  attention on specific objects and areas; accent lighting
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Lighting measurement unit is  called  candlepower Candlepower -amount of light  given by a standard candle of  controlled size and composition candella =1 candlepower Footcandle -the light delivered to a  surface one foot away from a  standard candle Light meter-  used to measure  lighting levels in units of  footcandles; tables of  recommended illumination levels  for various purposes in lighting 
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LIGHTING_Part_II - LIGHTING CHAPTER11:PartII...

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