For the purpose of this subchapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
FIXTURE. The assembly that holds the lamp (bulb) in the 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 parts.
FOOTCANDLE. The American unit used to measure the total amount of light cast upon a surface (illuminance). One FOOTCANDLE is equivalent to the illuminance produced by a source of one candle at a distance of one foot. For example, the full moon produces .01 S. “S” are measured with a light meter. One FOOTCANDLE is approximately equal to ten lux, the British unit used to measure illuminance.
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.
GLARE. Discomfort experienced by an observer with a direct line of sight which often results in annoyance, discomfort or loss of visual performance causing visual impairment.
HORIZONTAL (OR VERTICAL) FOOTCANDLES. The amount of light striking a vertical or horizontal plane.
LIGHT SOURCE. The bulb and lens, diffuser or reflective enclosure.
LIGHT TRESPASS. Light projected onto a property from fixtures not located on that property.
LUMEN. The unit used to quantify the amount of light energy produced by a lamp at the lamp. LUMEN output of most lamps is listed on the packaging. For example, a 60-watt incandescent lamp produces 950 lumens while a 55-watt low pressure sodium lamp produces 8,000 lumens.
NEON SIGNS. Luminous tube sign that contains neon or other inert gasses at a low pressure.
(Ord. O-2021.16, passed 11-16-2021)