(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 is not visible.
(b) Director 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) 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.
(f) Glare - light emitting from a luminaire with an intensity great enough to cause annoyance, discomfort, or loss of visual performance and visibility.
(g) HID Light Source - means a lamp which utilizes a small gas arc discharge or "high intensity discharge" as the light emitter. Examples of HID light sources are mercury, metal halide and high-pressure sodium lamps.
(h) Light Trespass- the unwanted shining of direct light produced by a luminaire beyond the boundaries of the property on which it is located, also meaning light that is of an intrusive and objectionable nature.
(i) Lumen - the unit measure of light flux or light output from lamps and luminaires.
(j) Luminaire - a complete lighting unit typically consisting of all electrical and mechanical parts necessary for operation including a lamp, ballast (in the case of discharge lamps), optical assembly and enclosure.
(k) Lux - the SI unit of illuminance. One lux is one (1) lumen per square meter and approximately 0.1 foot-candles.
(l) 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 75% of new lamp lumen output.
(m) Temporary Outdoor Lighting - lighting that is applied temporarily for construction, safety, seasonal events, or public events.
(Ord. 2019-39. Passed 8-13-19.)