Lighting Exam 2

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34 Terms

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Lumens=
Light output
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Lumens is…
The total amount of light emitted from a light source
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More Lumens=

Less Lumens=
Brighter

Dimmer
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The wattage of a light source does/doesn’t tell you how bright the light is
Doesn’t
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Footcandle (FC) is
Unit of measurement
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One foot candle is equal to…
The light produced by one candle at a distance of one foot away
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Luminous Flux
Time rate of flow of light
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Unit for Luminous Flux
Lumen
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Luminous flux is total…
Light emitted from a source
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Luminous intensity
Amount of flux (Lumens) contained within a solid angle
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Luminous intensity is the…
Amount of light in a given direction
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Unit for luminous intensity
Candela (cd)
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Illuminance
Flux (or Lumens) falling on a surface per unit area
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Unit for illuminance
Footcandle or lux (lx)
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Exitance
Luminous flux density leaving a surface
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Unit for exitance
Lumens/sqft or Lumens/sq meter
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Luminance
Amount of light leaving a surface in a given direction
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Unit for luminance
Candela/sqft or candela/sq meter
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Inverse square law
Light is inversely proportional to the square of the distance from the source of the light
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Cosine law for illuminance
The illumination of a surface is directly proportional to the cosine of the angle between the normal to the surface and the direction of incident light
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The five metrics to describe lighting
Luminance, flux, exitance, illuminance, intensity
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Symbol for Illuminance
E
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Symbol for Flux
Φ
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Symbol for intensity
I
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Symbols for Exitance
M
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Symbol for Luminance
L
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The density of light (or illuminance) on a given surface is a function of the ___________________ and ___________________ of the light source from the surface. 
Distance and angle
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What is considered the longest day of the year
Summer solstice
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Horizontal light shelves help to minimize direct light into the space and allow light to bounce further into the space. Which orientation do horizontal light shelves have the biggest benefit
South
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If two different light sources(LED and incandescent) have the exact same lumen output (600lm), will they also use the same amount of wattage?
No, the wattages will be different