Advanced Lighting Guidelines Glossary
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ALL A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0-9
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Definition
California?s Title 24 Building Energy Code The Energy Efficiency Standards for Residential and Nonresidential Buildings were established in 1978 in response to a legislative mandate to… More »
Candela Unit of luminous intensity. The measurement of light intensity emitted in a specific direction from a luminaire. Original Chapter Source:… More »
Candela distribution chart See candela distribution table Original Chapter Source: Luminaires Provided By: Craig DiLouie More »
Candela distribution curve Graphical representation of select data in the candela distribution table, visually depicting the relative light intensity for a single vertical… More »
Candela distribution table Element of luminaire photometric report typically presented in the manufacturer catalog sheet for the product. The table, also called the… More »
Candela per square meter (Cd/m2) Unit of luminance in the metric system. The English unit equivalent is candelas per square foot (Cd/ft2). Original Chapter Source:… More »
Candlepower The measure of the intensity of a light source in a given direction, measured in candelas (Cd). Candlepower distribution curves… More »
Carbon neutral Total operations that release zero carbon dioxide into the atmosphere. Original Chapter Source: Luminaires Provided By: Leslie North More »
Cataract A common cause of partial sight. Cataract is the formation of an opacity in the eye, usually in the lens,… More »
Cathode sputtering The process by which cathode material is slowly eroded away by electron mercury ion bombardment. Original Chapter Source: Sources Provided… More »
Chorio-retinal injury Thermal damage to the retina produced by focusing visible and infrared radiation up to 1400 nm onto the retina. Original… More »
CIE Commission Internationale de l'Eclairage (International Lighting Commission) Original Chapter Source: Luminaires Provided By: Naomi Miller More »
Circadian rhythms Circadian rhythms are physical, mental and behavioral changes that follow a roughly 24-hour cycle, responding primarily to light and darkness… More »
Circadian system The physiology of the body that controls the 24 hour variation in hormonal balance and, consequently, activity and behavior. Original… More »
Circumsolar area The region of very high brightness around the solar disk. Original Chapter Source: Daylighting Provided By: Kosta Papamichael / CLTC More »
Clerestory The part of a building rising clear of the roofs or other parts, whose walls contain windows for lighting the… More »
Closed loop Photocontrol system that measures combined daylight/electric light level on a representative task surface in the controlled space and adjusts light… More »
CMH lamp The designation for ceramic metal halide lamps in which the arc tube material is a ceramic rather than quartz. Original… More »
Coefficient of utilizaton (CU) Coefficient of Utilization (CU) is the percentage of light generated by the lamps in a luminaire that reaches the work… More »
Color Rendering Index (CRI) A scale of values from to 100, indicating how a light source makes a material color look compared to… More »
Color Temperature or Correlated Color Temperature (CCT) A specification of the apparent color of a light source relative to the color appearance of an ideal incandescent source… More »
Commissioning A systematic process that ensures that all elements of the lighting control system perform interactively and continuously according to documented… More »
Compact Fluorescent Lamp (CFL) A fluorescent lamp using compact folded or spiral tubes. Some models include integral ballast and screw base which allows them to… More »
Context parameters Parameters beyond the control of designers that affect performance. Original Chapter Source: Daylighting Provided By: Kosta Papamichael / CLTC More »
Continuous dimming Control of the intensity of a light source without abrupt transitions between light levels. Original Chapter Source: Controls Provided By:… More »
Contrast Also known as luminance contrast, it is the relationship between the luminances of an object and its immediate background. [Source:… More »
Contrast magnitude The ratio between two adjacent luminance values. Original Chapter Source: Daylighting Provided By: Kosta Papamichael / CLTC More »
Contrast sensitivity The reciprocal of threshold luminance contrast. Original Chapter Source: Health & Performance Provided By: Peter Boyce More »
Control panel Cabinet-type enclosure containing a series of relays that receive low-voltage ON/OFF signals from another device and respond by switching the… More »
Control station Control stations enable aggregation of control of multiple dimmers into a single interface between the user and the controller (dimming… More »
Control zone A luminaire or group of luminaires controlled simultaneously by a single controller. Original Chapter Source: Controls Provided By: Craig DiLouie More »
Controller Generic term describing the device in a control system that electrically changes the output of the lighting system. Original Chapter… More »
Cooling loads The rate at which heat must be removed from a building or space to achieve thermal comfort for the occupants.… More »
Core body temperature The inner temperature of the body that is stabilized by thermoregulation. Original Chapter Source: Health & Performance Provided By: Peter… More »
Cornea The transparent front surface of the eye. Original Chapter Source: Health & Performance Provided By: Peter Boyce More »
Correlated color temperature A specification of the apparent color of a light source relative to the color appearance of an ideal incandescent source… More »
Cosine sensitivity The property of cosine corrected light meters in which the sensitivity to light decreases with the cosine of the angle… More »
Critical fusion frequency See Flicker fusion frequency. Original Chapter Source: Light & Vision Provided By: Heschong Mahone Group / Peter Boyce More »
Cylindrical illuminance The average illuminance on the surface of an infinitesimally small, vertical cylinder. Original Chapter Source: Light & Vision Provided By:… More »
ALL A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0-9

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