Definitions specific to outdoor illumination.
CONSTRUCTION LIGHTINGExterior lighting used primarily to illuminate highway or building construction areas.
[Added 2-26-2024 by L.L. No. 4-2024]
CUTOFF FIXTUREA light fixture that restricts the amount of light emission by shielding parts of the lamp. A cutoff, or semi-cutoff design allows a restricted amount of light emitted above the horizontal plane running through the lowest point on the luminaire.
FIXTUREThe assembly that holds the lamp (bulb) in a lighting system. It includes the elements designed to give light output control, such as a reflector (mirror) or refractor (lens), the ballast, housing and the attachment (mounting) parts.
FOOTCANDLEA footcandle is the basic measuring unit of illuminance (the amount of light falling on a surface). Footcandle measurement is taken with a light meter. One footcandle is approximately equal to the illuminance produced by a light source of one candela in intensity, measured on a surface at a one foot distance from the source. Horizontal and vertical footcandles measure the illumination striking a horizontal plane or vertical plane, respectively.
FULL CUTOFF FIXTURE (FCO)A light fixture that cuts off all upward transmission of light above an angle of 90° from the horizontal plane at the lowest part (nadir) of the luminaire.
FULLY SHIELDED FIXTUREA luminaire constructed and installed such that all light emitted, either directly from the lamp or a diffusing element, or indirectly by reflection or refraction from any part of the luminaire, is projected below the horizontal. It is the same as a full cut-off luminaire, but without any restrictions on light distribution below the horizontal plane.
GLAREDiscomfort experienced by an observer with a direct line-of-sight to a light source which often results in visual impairment due to an intensity great enough to reduce the viewer's ability to see.
LIGHT TRESPASSLight projected onto a property from a fixture not on that property.
LUMENA measure of the brightness of the illumination exiting a bulb, provided by a manufacturer. One footcandle is one lumen per square foot.
LUMINAIREA luminaire is a complete lighting fixture, including the lamp, housing, ballasts, and photocells, less the support and mounting assembly.
TEMPORARY LIGHTINGLighting intended for uses which by their nature are of limited duration, such as civic events, filming, theatrical, television or performance activities, or construction projects.
[Amended 2-26-2024 by L.L. No. 4-2024]