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
Item
Definition
PAR lamp A type of reflector lamp with a Parabolic Aluminized Reflector. PAR lamps are sometimes called pressed glass reflector lamps because… More »
Parallel When lamps are wired to a ballast in parallel, if any of the connected lamps fail, the remaining lamps continue… More »
Passive infrared (PIR) Occupancy sensing method that detects occupancy by reacting to the movement of infrared heat energy emitted by people. Original Chapter… More »
PCB (Printed Circuit Board) Printed circuit boards are laminates of copper and dielectric polymer layers used to mount electronic components and carry electrical signals… More »
Peak consumption periods need definition More »
Peak demand Maximum electric demand load (kW) sustained for specified period (typically 15 minutes duration) . Original Chapter Source: Design Considerations Provided… More »
Peak electricity demand The highest amount of electrical power needed over a particular period of time. Original Chapter Source: Daylighting Provided by: Kosta… More »
Peak load See peak demand. Original Chapter Source: Policies & Programs Provided By: Craig DiLouie More »
Peak period See peak demand. Original Chapter Source: Policies & Programs Provided By: Craig DiLouie More »
Peak use See peak demand. Original Chapter Source: Policies & Programs Provided By: Craig DiLouie More »
Performance parameters Parameters used to evaluate performance. Original Chapter Source: Daylighting Provided by: Kosta Papamichael / CLTC More »
Performance Testing Project phase in which a contractor, under the supervision of the commissioning authority, inspects and tests installed systems to ensure… More »
Peripheral vision Visual activity involving off-axis vision is peripheral vision. Original Chapter Source: Health & Performance Provided By: Peter Boyce More »
Phase The timing of a repetitive oscillation at which it reaches an identifiable condition such as a maximum or a minimum.… More »
Photocell A light-sensitive device for measuring light intensity. (Also called a photosensor.) Original Chapter Source: Controls Provided By: Craig DiLouie More »
Photocontrols See daylighting control. Original Chapter Source: Policies & Programs Provided By: Craig DiLouie More »
Photokerititis Photochemical damage to the cornea caused by exposure to ultraviolet radiation. Original Chapter Source: Health & Performance Provided By: Peter… More »
Photoluminescence or "PL" A process in which a substance absorbs photons from some light source and, after a delay, re-radiates photons. The delay… More »
Photon An elementary particle, the basic unit of light. Original Chapter Source: Health & Performance Provided By: Peter Boyce More »
Photopic (photopic vision) The state of vision in which cone photoreceptors are dominant. Conventionally, photopic vision is taken to occur at adaptation luminances… More »
Photopigment A light-sensitive chemical contained in a photoreceptor. Original Chapter Source: Light & Vision Provided By: Heschong Mahone Group / Peter… More »
Photoreceptor A structure in the retina where light entering the eye is absorbed and converted into electrical signals. Original Chapter Source:… More »
Photoretinitis Photochemical damage to the retina caused by exposure to short wavelength visible light. Previously known as blue-light hazard. Original Chapter… More »
Photosensor A light-sensitive device for measuring light intensity. (Also called a photocell.) Original Chapter Source: Controls Provided By: Craig DiLouie More »
Phototransduction The process by which light is converted into electrical signals. Original Chapter Source: Health & Performance Provided By: Peter Boyce More »
Photovoltaics Field of technology related to the application of solar cells for conversion of daylight into electricity. Original Chapter Source: Luminaires… More »
Pigment epithelium The part of the eye immediately behind the retina. The pigment epithelium supplies nutrients to the retina and absorbs any… More »
Plasma Lighting An electrodeless lighting system consisting of a magnetron producing an electromagnetic field around a glass capsule inside an electrodeless lamp,… More »
Plenum In interior spaces, the Plenum is the space between the ceiling and either the next floor above or the roof.… More »
Polarization A process by which the electromagnetic field of light becomes oriented in particular directions. Original Chapter Source: Light & Vision… More »
Power factor The ratio of active power (in watts) to apparent power (in rms volt-amperes), power factor is a measure of how… More »
Power Grid The system of power production plants and distribution lines that deliver power to its end users. Original Chapter Source: Policies… More »
Power quality The degree to which current and voltage wave forms conform to a sinusoidal shape and are in synchronous phase with… More »
Power Supply (LED) An electronic device that transforms an incoming power supply to another form to be used by an electronic device.  For… More »
Powerline carrier (PLC) Method of lighting control involving using line-voltage power wires as communication pathways for control signals. Original Chapter Source: Controls Provided… More »
Prismatic structures Faceted structures on a transparent material that modify the direction of the light traveling through that material. These structures usually… More »
Profile angle A characteristic of horizontal lines, such as the edges of an overhang, in reference to a point of interest, such… More »
Programmable-Start Ballast Advanced type of fluorescent rapid-start electronic ballast. Upon energizing of the circuit, the ballast preheats the lamp cathodes prior to… 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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