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

Light: Electromagnetic radiation that stimulates the visual system of a typical
human.
Light Emitting Diode (LED): A Light source technology that relies on electricity passed through a solid state electrical device that emits a single wavelength of radiation.
Light Loss Factor (LLF): A safety factor used in lighting calculations that
accommodates for the loss of light production of a luminaire over time due to dirt, ballast depreciation and lumen output depreciation Light Map: The author’s term for a visual document that expresses lighting intent through
colored graphics on an architectural furniture or floor plan.
Louver: A bladed shielding device implemented in a luminaire to reduce the visibility of a bare lamp
Lumen: an expression of radiant energy flux as it impacts the human visual
system.
Luminaire: A device that controls the delivery of light through the management of electricity and the inclusion of ballasts, transformers, optical elements, reflectors and architectural mounting mechanisms.
Luminous Flux: The total quantity of visible radiant energy that leaves a light
source in all directions. Expressed in Lumens.
Lux (LX): The SI unit of expressing light flux incident onto a surface (illuminance)
O
Occupancy sensor: Device that implements heat, sound and motion detection to determine whether a space is in use.
P
PAR Lamp: Lamp shape that utilizes a parabolic aluminized reflector to deliver controlled directional light. Commonly associated with Halogen and Metal Halide sources Photometry: The science of measuring light output distribution, patterns and effects from light sources.
R
Recessed Luminaire: A luminaire that resides primarily in the plenum above the ceiling line of a space.
Reflectance: An expression of the percentage of light incident onto a surface
that in turn leaves the surface.