Definitions.
ARCHITECTURAL/DECORATIVE LIGHTING
Lighting that is decorative, and/or used to illuminate architectural and/or landscaped features and pedestrian areas, and primarily installed for aesthetic effect. May be wall or ground mounted.
FIXTURE
A complete lighting assembly (including the lamp, housing, reflectors, lenses, and shields), less the support assembly (pole or mounting bracket); a light fixture. Includes luminous tubes, lamps or similar devices, permanently installed or portable, used for illumination, decoration, or advertisement.
FOOTCANDLE
A quantitative unit measuring the amount of light cast onto a given point, measured as one lumen per square foot.
FULL CUTOFF/FULL SHIELD FIXTURE
A light fixture shielded or constructed in such a manner that it emits no light above the horizontal plane through the luminaire’s lowest light-emitting part.
GLARE
Intense or blinding light that is sufficiently brighter than the level to which the eyes are adapted, to cause visual discomfort, or loss of visual performance and ability.
LIGHT SOURCE
The element of a lighting fixture that is the point of origin of the lumens emitted by the fixture.
LIGHT TRESPASS
Light falling where it is not wanted or needed including spill light and obtrusive light.
LUMEN
A quantitative unit measuring the amount of light emitted by a light source.
LUMINAIRE
The complete lighting unit, including the lamp, the fixture, and other parts.
NON-CUTOFF FIXTURE
A light fixture that has no limitations on light distribution at any angle.
PARTIALLY SHIELDED
A luminaire shielded in such a manner that more than zero but less than ten percent of the light emitted directly from the lamp or indirectly from the fixture is projected at angles above the horizontal plane through the luminaire’s lowest light-emitting part and includes semi-cutoff fixtures.
SEMI-CUTOFF FIXTURE
A luminaire shielded in such a manner that more than zero but less than five percent of the light emitted directly from the lamp or indirectly from the fixture is projected at angles above the horizontal plane through the luminaire’s lowest light-emitting part.
UPLIGHTING
A lamp or wall light designed or positioned to cast its light upwards. The lights shall be designed to minimize light that does not illuminate the target area. The light source shall be screened or shielded from adjoining properties.