§ 14-82. Definitions.

The following words, terms and phrases, when used in this article, shall have the meanings ascribed to them in this section, except where the context clearly indicates a different meaning:

Average to minimum means the ratio of average footcandles to the minimum footcandle point calculation or reading for a given area. This ratio is generally maintained footcandles but could be initial. This ratio is an indicator of lighting uniformity. The lower the ratio, the better the uniformity.

Candlepower means luminous intensity. The term "candlepower" is normally associated with a directional type fixture such as a floodlight.

Direct light means light emitted directly from the lamp, off of the reflector or reflector diffuser, or through the refractor or diffuser lens, of a luminaire.

Fixture means the assembly that houses the lamp or lamps and can include all or some of the following parts: a housing, a mounting bracket or pole socket, a lamp holder, a ballast, a reflector or mirror, and/or a refractor or lens.

Floodlight or spotlight means 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 with a wide or narrow beam.

Footcandle means the amount of light falling on a surface, measured or calculated. It can be quantified as one lumen per square foot.

Footcandles, average, means the average of a number of points of footcandle calculations or footcandle readings in a given area. They could be initial or maintained.

Footcandles, average maintained, means the average of a number of points of footcandle calculations or footcandle readings in a given area which have been adjusted to account for maintenance factor, which includes luminaire dirt depreciation (LDD) and lamp lumen depreciation (LLD).

Footcandles, initial, means footcandles that are calculated with no adjustment for dirt build-up in the fixture or lamp lumen depreciation. Initial footcandles should be measured when a lighting system is new and after 100 hours of lamp burn-in time. Car dealerships are often designed using initial footcandles.

Footcandles, maintained, means footcandles that are calculated with an adjustment for a maintenance factor to include dirt buildup in the luminaire (fixture) and lamp lumen depreciation. The system is, in effect, overdesigned initially and then, over time, allowed to reach a maintained footcandle level.

Full cutoff (fully shielded lights) means outdoor light fixtures shielded or constructed so that no light rays are emitted by the installed fixture at angles above the 90-degree horizontal plane, as certified by a photometric test report.

Glare means light emitting from a luminaire with an intensity great enough to reduce a viewer's ability to see or, in extreme cases, causing momentary blindness.

Indirect light means direct light that has been reflected or that has scattered off of other surfaces.

Lamp means the component of a luminaire that produces the actual light.

Light trespass means the shining of light produced by a luminaire beyond the boundaries of the property on which it is located.

Lumen output, initial, means ratings of a lamp as listed in a lamp catalog.

Lumens means the total quantity of light emitted from a light source, or a unit of luminous flux. One footcandle is one lumen per square foot. For the purpose of this article, the lumen output values shall be the initial lumen output ratings of a lamp.

Luminaire means a complete lighting system and includes a lamp or lamps and a fixture, housing, reflector, refractor, etc.

Maximum to minimum means the ratio of the maximum footcandle point calculation or reading to the minimum footcandle point calculation or reading for a given area. This ratio is generally maintained footcandles but could be initial. This ratio is an indicator of lighting uniformity. The lower the ratio, the better the uniformity.

Maximum means the maximum footcandle point calculation or reading in a given area. The maximum is generally maintained footcandles but could be initial.

Minimum means the minimum footcandle point calculation or reading in a given area. The minimum is generally maintained footcandles but could be initial.

Mounting height of luminaire means the vertical distance from the ground directly below the centerline of the luminaire to the center of the light source (lamp) in the luminaire.

Outdoor lighting means the nighttime illumination of an outside area or object by any manmade device located outdoors that produces light by any means.

Preexisting luminaires means luminaires not conforming to this article that were in place at the time the ordinance from which this article is derived was adopted.

Temporary outdoor lighting means the nighttime illumination of an outside area or object by any manmade device located outdoors that produces light by any means for a period of less than seven days, with at least 180 days passing before being used again.

(Ord. No. O-2000-01, art. 1, 8-14-2000)