The architecture of light: architectural lighting design concepts and techniques. A textbook of procedures and practices for the architect, interior designer and lighting designer pdfdrive com

Chromaticity: The level of saturation evident in a colored material or colored
light source.
Coefficient of Utilization (CU): A factor used in lumen method calculations to express how effectively light is being delivered from a luminaire to the surface in question Color Rendering Index (CRI): An expression of the completeness of the spectral output of a light source. Indicates how accurately a light source will reveal colors in the lighted environment.
Expressed on a scale from 1 to 100: the higher the number, the more
complete the spectral output and the more accurate the color rendition.
Color temperature: A manner of describing the apparent color of a light source. Commonly used to express the cool or warm color of a source that deviates from neutral. Expressed in degrees Kelvin or Kelvins (K) D
Daylight: A general reference to the quality of light received from the sun as it
diffuses through the atmosphere of the earth, including both direct sunlight and diffused skylight.
Diffuse Light: Light which is scattered in all directions in relation to its source
Diffuser: Lens material used to scatter the light output of a source in all directions
Dimmer: A lighting control device that varies the electricity delivered to a
luminaire to control the output of light.
Directional Light: Light that leaves a source in a single direction through means of reflectors or optical control.
Direct Burial (Luminaire): A luminaire that resides primarily in the ground or
floor structure of a space and casts light upward.
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Efficacy: Used in lighting as an expression of how well a light source converts electricity into radiant light energy. Expressed as Lumens of light per Watt of electricity for Lumens per Watt (L / W) Exitance: An expression of the light quantity leaving a reflective surface in all directions.
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