As used in chapter 5, article G, "Outdoor Lighting Standards", of this title, the following definitions shall apply. The general definitions contained in chapter 9, article A of this title shall apply to all terms used in chapter 5, article G of this title that are not defined in this section.
BULB: The part of a fixture or luminaire that produces light.
CUTOFF FIXTURE: A luminaire that has a light distribution where the candlepower does not exceed two and one-half percent (2.5%) of the lamp's rated initial lumen output at an angle of ninety degrees (90°) above nadir, and does not exceed ten percent (10%) of the lamp's rated initial lumen output at a vertical angle of eighty degrees (80°) above nadir. This applies to all lateral angles around the luminaire.
FIXTURE: The assembly that holds the bulb in a 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.
FULL CUTOFF FIXTURE: A luminaire that has a light distribution where the candlepower does not exceed zero percent (0%) of the lamp's rated initial lumen output at an angle of ninety degrees (90°) above nadir, and does not exceed ten percent (10%) of the lamp's rated initial lumen output at a vertical angle of eighty degrees (80°) above nadir. This applies to all lateral angles around the luminaire.
FULLY SHIELDED LIGHT FIXTURE: A lighting fixture constructed in such a manner that all light emitted by the fixture, either directly from the bulb or a diffusing element, or indirectly by reflection or refraction from any part of the luminaire, is projected below the horizontal as determined by a photometrics test or certified by the manufacturer. Any structural part of the light fixture providing this shielding must be permanently affixed.
GLARE: The sensation produced by a bright light source within the visual field that is sufficiently brighter than the level to which the eyes are adapted as to cause annoyance, discomfort, or loss in visual performance and visibility; blinding light. The magnitude of glare depends on such factors as the size, position, brightness of the source, and on the brightness level to which the eyes are adapted.
IESNA: The Illuminating Engineering Society of North America.
INVENTORY OF LIGHTING: A list of bulbs indicating the bulb type, bulb wattage, and initial lumens for each bulb and the manufacturer through which the rated lumens can be determined.
LIGHT TRESPASS: Light projected onto a property from a fixture not located on that property. In some cases, such as with multi- family or mixed-use development, trespass can result from on site fixtures projecting into residential portions of the development.
LUMEN (lm): Measure of brightness of the illumination exiting a bulb, as provided by the manufacturer.
LUMINAIRE: The complete lighting unit, including the bulb, the fixture, pole or armature and other parts.
NADIR: The vertical line projecting downward to the ground from the center of the lens of a luminaire.
NONCUTOFF: A light fixture that does not cut off the upward transmission of light.
OUTDOOR LIGHT OUTPUT, TOTAL: The initial total amount of light, measured in lumens, from all bulbs used in outdoor light fixtures. Includes all lights and luminous tubing used for display lighting, general illumination, architectural/accent lighting, and lights used for external illumination of signs, but does not include lights used to illuminate internally illuminated signs or luminous tubing used in neon signs. For bulb types that vary in their output as they age (such as high pressure sodium, fluorescent and metal halide), the initial lumen output, as defined by the manufacturer, in the value to be considered. (Ord. 05-4186, 12-15-2005)