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Definition
Eccentricity
The angle between the line of sight and the line from the eye to the position of the target. Original…
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Eddy current
Circulating flow of electrons (current) within a conductor which can create magnetic fields that oppose the change in magnetic field.…
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Efficacy (luminous efficacy)
Used in lighting as a measure of luminous efficiency where light (lumens) are compared to the electrical power (watts) used…
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Efficiency
A measure of the ability of a system to process energy (such as light) taking losses into account. Original Chapter…
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Electricity delivery grid
See power grid. Original Chapter Source: Policies & Programs Provided By: Craig DiLouie
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Electrochromic
Glass that has the ability to change its visible light transmittance with the application of an electric potential. Original Chapter…
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Electrodes
The structure that serves as the electric terminals at each end of electric discharge lamps. Original Chapter Source: Sources Provided…
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Emission mix
A coating that is place on fluorescent lamp electrodes to enhance electron production. Original Chapter Source: Sources Provided by: Erik…
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Energy Use Intensity (EUI)
Measure of energy efficiency of buildings expressed in kBTU per square foot. Original Chapter Source: Policies & Programs Provided by:…
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Equivalent Sphere Illuminance (ESI)
Visibility metric of how visible a specific target is under a proposed lighting system, as compared to the same target…
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Erythema
Reddening of the skin. There are many causes of erythema. Among them is excessive exposure to ultra-violet radiation leading ultimately…
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Exitance
The total quantity of light emitted by, reflected from, and transmitted through a surface into a complete hemisphere. It is…
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