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

Appendix A Glossary of Lighting Terms

A
Accommodation: The function of the dynamic components of the eye to focus on objects at different distances.
Adaptation: The function of the eye and brain working together to operate
under varying amounts of light.
Adjustable (Luminaire): Describes a luminaire that includes mechanical means to aim light output in a specific direction.
Ambient light: A description of the light quality that defines the overall
experience of a space.
Aperture: An opening cut into a form or surface. Often describes the opening a recessed luminaire creates in the ceiling B
Backlighting: The tactic of placing a light source behind an object or translucent
surface. This creates an effect of silhouetting solid objects or creating a luminous plane from a translucent material.
Baffle: a visual control device that mounts to the face of a light source to control
the angles at which the light source is directly visible.
Ballast: An electronic or magnetic device used to control electricity to start and operate fluorescent and HID light sources.
C
Candela (CD): a unit measurement of light density from a light source or reflective object. 1 Candela is the equivalent one lumen of light emitted evenly from a portion of spherical surface area called a steradian.
Candlepower: an expression of luminous intensity from a light source expressed
in Candelas.
Candlepower Distribution curve: A graphical representation of the light intensity leaving a light source in specific directions.
Center Beam Candlepower (CBCP): A commonly-used expression of
luminous intensity from the center-most area of a light source. (This is
typically the most luminous area of a light source) Choreography: the direction of movement and path of experience of an individual in the designed environment.