Definitions. Words and phrases used in this Subsection I shall have the meanings set forth in this Subsection I. Words and phrases not defined in this Subsection I but defined in Article III shall be given the meanings set forth in said article. All other words and phrases shall be given their common, ordinary meaning, unless the context clearly requires otherwise.
ARCHITECTURAL LIGHTING
Lighting designed to reveal architectural beauty, shape and/or form and for which lighting for any other purpose is incidental.
FOOTCANDLE
The amount of illumination the inside surface of a one-foot radius sphere would receive if there were a uniform point source of one candela in the exact center of the sphere. The footcandle is equal to one lumen per square foot, and is measurable with an illuminance meter (light meter).
FULL CUTOFF
Attribute of a luminaire from which no light is emitted at or above a horizontal plane drawn through the lowest light-emitting portion of the luminaire and no more than 10% of the lamp's intensity is emitted at or above an angle 10° below that horizontal plane, at all lateral angles around the luminaire. A full-cutoff luminaire, by definition, also is fully shielded.
FULLY SHIELDED
A luminaire with opaque top and sides, capable of emitting light only in the lower photometric hemisphere as installed.
GLARE
Light entering the eye directly from luminaires or indirectly from reflective surfaces that causes visual discomfort or loss in visual performance and visibility.
LAMP
A generic term for a source of optical radiation, often called a "bulb" or "tube."
LIGHT FIXTURE
The complete lighting assembly (including the lamp, housing, reflectors, lenses and shields), not included the support assembly (pole or mounting bracket).
LIGHTING SYSTEM
On a site, all exterior electric lighting and controls.
LIGHT TRESPASS
Light emitted by a luminaire or installation, which is cast beyond the boundaries of the property on which the lighting installation is sited.
LUMEN
As used in the context of this chapter, the light-output rating of a lamp (light bulb).
LUMINAIRE
The complete lighting unit (fixture), consisting of a lamp, or lamps and ballast(s) when applicable, together with the parts designed to distribute the light (reflector lens, diffuser) to position and protect the lamps, and to connect the lamps to the power supply.
LUMINAIRE, SHIELDED DIRECTIONAL
A fully shielded luminaire with an adjustable mounting device allowing aiming in a direction other than straight downward.