For the purpose of this chapter, the following definitions shall apply, unless the context clearly indicates or requires a different meaning:
(a) “Cut-off angle” (of a luminaire). The angle, measured up from the nadir, between the vertical axis and the first line of site at which the bare source of the bulb or light source is not visible.
(b) “Direct light.” Light emitted directly from the lamp, off of the reflector or reflector diffuser, or through the refractor or diffuser lens, of a luminaire.
(c) “Foot candle.” A unit of illuminance equal to one lumen per square foot or 10.76 lux.
(d) “Flood” or “Spotlight.” Any light fixture or lamp that incorporates a reflector or a refractor to concentrate the light output into a directed beam in a particular direction.
(e) “Glare.”Light emitting from a luminaire with an intensity great enough to cause annoyance, discomfort, or loss of visual performance and visibility.
(f) “Full cut-off or fully-shielded luminaire.”A luminaire constructed or shielded in such a manner that all light emitted by the luminaire, either directly from the lamp or indirectly from the luminaire, is projected below the horizontal plane through the luminaire's lowest light emitting part as certified by the manufacturer.
(g) “High Intensity Discharge (HID) lighting technology.” Lighting technology that uses a capsule of gas instead of a filament for a light bulb. The light is emitted from an arc discharge between two closely spaced electrodes hermetically sealed inside a small quartz glass tubular envelope capsule.
(h) “Light trespass.”The unwanted shining of direct light produced by a luminaire beyond the boundaries of the property on which it is located. Light that is of an intrusive and objectionable nature.
(i) “Luminaire.”The complete lighting unit or system and this includes a lamp or lamps and/or a fixture or fixtures.
(j) “Lux.” The SI unit of illuminance. One lux is one lumen per square yard.
(k) “Maximum mean average lux.” The maximum average lux level on a surface based upon the average lumen output of a lamp over its life. Average lumen output over the life of the lamp is typically about seventy-five percent of the new lamp lumen output.
(l) “Temporary outdoor lighting.”Lighting that is applied temporarily for construction, safety, seasonal events, or public events.
(Ord. 2008-O-18. Passed 10-28-08.)