[Ord. No. 2470 §1, 3-27-2012]
The following definitions shall be applicable to this Article.
FIXTUREThe assembly that holds the lamp (bulb) in a lighting system, including elements designed to give light output control, such as a reflector (mirror) or refractor (lens), the ballast, housing and attachment parts.
FOOT-CANDLEA unit of illuminance amounting to one (1) lumen per square foot.
FULL-CUTOFFA light fixture which cuts off all upward transmission of light.
FULLY SHIELDEDA fully shielded luminaire is 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 determined by photometric test or certified by the manufacturer.
GLAREThe sensation produced by luminance within the visual field that is sufficiently greater than the luminance to which the eyes are adapted or which causes annoyance, discomfort or loss in visual performance and visibility.
HIGH INTENSITY DISCHARGE (HID) LIGHTINGA family of bulb type including mercury vapor, metal halide, high pressure and low pressure sodium which glow when an electric current is passed through a gas mixture inside the bulb.
ILLUMINANCEThe quantity of light or luminous flux arriving at a surface divided by the area of the illuminated surface, measured in lux or foot-candles.
INVENTORY OF LIGHTSA list of lamps indicating the bulb type, bulb wattage and manufacturer through which the rated lumens can be determined.
LIGHT SOURCEThe bulb and lens, diffuser or reflective enclosure.
LIGHT TRESPASSLight projected onto a property from a fixture not located on that property.
LUMENMeasure of brightness of the illumination exiting a bulb, provided by the manufacture.
LUMINAIREA complete lighting unit consisting of a lamp or lamps, together with the parts designed to distribute the light, to position and protect the lamps and to connect the lamp to the power supply.
LUMINANCEThe physical quantity corresponding to the brightness of a surface (e.g., a lamp, luminaire, sky or reflecting material) in a specified direction. The luminous intensity of an area of the surface divided by that area measured in candelas per square meter.
LUX (LX)The SI unit of illuminance. One (1) lux equals one (1) lumen per square meter.
NON-CUTOFFA light fixture which does not cut off all upward transmission of light.
OBTRUSIVE LIGHTSpill light which, because of quantitative, directional or spectral context, gives rise to annoyance, discomfort, distraction or reduction in the ability to see essential information.
SPILL LIGHTLight emitted by a lighting installation that falls outside the boundaries of the property on which the installation is sited.