AXIS OF ILLUMINATION or CENTERLINE BEAM. The midline of the primary beam of light emitted by a spotlight, floodlight or other fixture.
CONSTANT LIGHTING. A light fixture meant to operate continually, and not meant to operate only briefly upon activation by a motion sensor or other device. A motion detector activated light would be a non-constant light.
FIXTURE. The bulb and the assembly that holds the bulb (or lamp), in a lighting system, including the elements that provide light output control such as a reflector (mirror) or refractor (lens) and the ballast, photosensor, and housing.
FLOODLIGHT.
(1) A luminaire or bulb which projects light in a specific direction in a wide beam, typically 100 degrees or more.
(2) A fixture or bulb which is intended to project light primarily in a broad directed beam, typically 100 degrees wide.
FOOT-CANDLE. A measure of illumination striking a surface. Measured by a light meter.
FULL-CUTOFF (fco). A light fixture which cuts off all upward transmission of light.
FULLY SHIELDED. A fixture with housing or attachment thereto which prevents a line of sight to the bulb when viewed from another property and which prevents a line of sight to any part of the light source at or above a horizontal plane running through the lowest portion of the fixture.
GAS DISCHARGE LAMP. Family of bulb type that produces illumination by passing an electric current through gas. Includes low and high-pressure sodium, mercury vapor, metal halide and florescent.
GLARE. Discomfort experienced by an observer with a direct line of sight to a light source which often results in annoyance, discomfort or loss of visual performance causing visual impairment.
HID LIGHTING. A family of bulb type known as high intensity discharge, including high-pressure sodium, mercury vapor, and metal halide.
HORIZONTAL (OR VERTICAL) FOOT-CANDLES. The amount of light striking a vertical or horizontal plane.
INVENTORY OF LIGHTING. A list of fixtures relative to a parcel, indicating fixture cutoff design, location, and bulb type, wattage, and bulb manufacturer from which a lumen rating can be determined.
IESNA. Illuminating Engineering Society of North America.
LAMP. The bulb.
LIGHT SOURCE. Source from which light emanates either directly from the bulb, or indirectly from a reflective enclosure, lens, or diffuser.
LIGHT TRESPASS, OR SPILLAGE. Light projected onto property or onto a right-of-way from another property.
LUMEN. The unit used to measure the actual amount of light that is produced by a bulb as provided by the manufacturer. A 60-watt incandescent household bulb is usually 890 lumens. For the purposes of this subchapter, for HID lighting LUMENS means initial lumens.
LUMEN CAP. The specified maximum number of lumens allowed for an application of outdoor lighting.
LUMINAIRE. The complete lighting unit, including the lamp, fixture, and other parts.
OUTDOOR LIGHT. A fixture which illuminates an exterior area. Includes lighting at locations such as under canopies, pavilions, or drive-through bays not fully enclosed such that the fixture or the illuminated area is visible from beyond the property line.
SPOTLIGHT. A fixture or bulb which projects light in a specific direction in a narrow beam, typically 45 degrees or less.
(Ord. 08-04, passed 7-14-08; Am. Ord. 14-23, passed 1-26-15)