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Definition
| Graphs that illustrate the direction, pattern, and intensity of light emitted from luninaires |
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| The lightness or darkness of a color |
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Definition
| The strength or purity of a color |
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Term
Correlated Color Temperature
(CCT) |
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Definition
| A color temperature in kelvins determined by the x and y location on a color diagram |
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Definition
| A phenomenon that occurs when a color appears to change as a result of surronding colors |
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Definition
| a distracting high illuminance level that can cause discomfort or be disabling |
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Definition
| A distracting high illuminance level that is frequently caused by veiwing a bare light source |
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Definition
| A distracting high illuminance level that is caused by a light source reflecting off a surface or object |
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Term
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Definition
| a distracting high level glare |
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Definition
| a high level glare that prevents you from seeing |
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Term
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Definition
| the ratio of incident light to the light reflected from a surface of material |
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Definition
| The rays of light emitted from a source before they strike an object or surface |
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Definition
| results of light bouncing back and forth within an enclosed space or structure |
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Definition
| when the light is scattered in one direction |
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| semi-specular refelctance |
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Definition
| reflectance when light is scattered primarily in one direction |
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Term
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Definition
| when an object with a matte finish causes light to scatter in different directions |
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Term
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Definition
| unit of measurement that indicates the amount of light in the eyes of users of a space after reflection or transmission from a surface |
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Definition
| the unit of luminaire designed to reflect light |
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Term
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Definition
the change in the direction of a wave.
same principle as light passing through a prism
straw in glass of water |
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Term
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Definition
| term used to describe materials that allow most light to pass throug |
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Definition
| the distribution of light rays from a source |
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Definition
| the unit of measurement that indicates the total amount of illumination emitted by a source |
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Definition
| unit of measurement from a source in a specific direction, on a solid angle |
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Term
Luminous Efficacy Ratio
(LER) |
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Definition
| a ratio of the number of watts consumed through the entire luminaire spectrum |
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Term
Lamp Lumen Depreciation
(LLD)
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Definition
| a metric measurement that examines the lass of lumens resulting from the design of a lamp |
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Term
Luminaire dirt depreciation
(LDD) |
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Definition
| the loss of light that results from dirt and dust accumulation |
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Definition
a measure of the amount of electrical stimulus that enables current to flow through a circut
increase V = increase current |
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Definition
| a measure fo the quantity of electrical particle flow in a current |
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Term
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Definition
| a measure of a circuts ability to resist or impede the flow of electrical current |
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Definition
| lamps that operate together on one circut |
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Definition
| lamps that opperate independently of one another and are not load-sensitive |
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Definition
| distribution of light when at least 90% of the illumination is downward |
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Term
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Definition
| distribution of like when majority is direct towards ceiling |
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Definition
| distribution of lighting where most is down but some is up |
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Definition
| distribution of light where most is directed up but some is down |
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Term
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Definition
| distribution of light in all directions |
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Term
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Definition
| devices in luminaires that are shaped to redirect light by reflection |
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Term
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Definition
| cover on a luminaire that scatterslight in many directions; made from white plastic or etched glass |
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Term
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Definition
| devices, usually prismatic lenses that direct light through refraction |
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Definition
| lens of a luminaire composed of concentric circles with a flat of domes surface |
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Definition
| lighting method on ceiling that utilizes rows of lamps behind diffused lenses |
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Definition
| electrical device that converts voltage in a a system |
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Definition
| device that controls a luminaire by regulating the flow of electricity through a circut |
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Definition
| device designed to decrease light output by reducing power to a lamp |
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Definition
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Term
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Definition
| device used to detect the amount of illumination in a space and adjust lighting levels |
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Definition
| direct/indirect light that helps reduce the intensity of dark areas |
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Definition
| wasted light that is emitted from an opening |
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Term
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Definition
| when two samples look the same color under one light, but dont match in another light source |
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