1. “Accent lighting” means any luminaire that emphasizes a particular object or draws attention to a particular area for aesthetic purposes.

2. “Ambient light” means general illumination of an area.

3. “Backlight” means, for an outdoor luminaire, lumens emitted in the quartesphere below horizontal and in the opposite direction of the intended orientation of the luminaire. For luminaires with symmetric distribution, backlight will be the same as the front light.

4. “BUG” means a luminaire classification system that classifies backlight (B), uplight (U) and glare (G).

5. “Canopy” means a covered, unconditioned structure with a least one side open for pedestrian and/or vehicular access. (An unconditioned structure is one that may be open to the elements and has no heat or air conditioning).

6. “Curfew” means a time defined by the city when outdoor lighting must be reduced or extinguished.

7. “Cut-off angle” (of a luminaire) means the angle, measured from the lowest point between a vertical line from the center of the lamp extended to the ground and the first line of sight at which the bare source is not visible.

8. “Footcandle (FC)” means a measure of illuminance or a measure of how bright a light appears to the human eye. One footcandle is equal to one lumen/square foot. As an example, a typical 60-watt incandescent lamp (840 lumens) produces an illuminance of 0.1 footcandles at a distance of about 25 feet.

9. “Glare” means lighting entering the eye directly from luminaires or indirectly from reflective surfaces that causes visual discomfort or reduced visibility.

10. “Hardscape” means permanent improvements to the site including parking lots, drives, entrances, curbs, ramps, stairs, steps, medians, walkways and nonvegetated landscaping that is 10 feet or less in width. Materials may include concrete, asphalt, stone, gravel, or similar substances.

11. “Hardscape area” means the area measured in square feet of all hardscape. It is used to calculate the total site lumen limit in both the prescriptive method and performance methods.

12. “Hardscape perimeter” means the perimeter measure in linear feet of the hardscape. It is used to calculate the total site lumen limit in the performance method. Refer to “hardscape” definition.

13. “IESNA” means Illuminating Engineering Society of North America.

14. “Lamp” means the light-producing mechanism of a luminaire.

15. “Light pollution” means any adverse effect of artificial light.

16. “Light trespass” means light falling where it is not wanted or needed (also referred to as spill light or obtrusive light).

17. “Lighting zone” means an overlay zoning system establishing legal limits or regulations for lighting for particular parcels, areas or districts in a community.

18. “Lumen” means a unit of measure used to quantify the amount of light produced by a lamp or emitted from a luminaire (as distinct from “watt,” a measure of power consumption).

19. “Luminaire” means the complete lighting unit, consisting of a lamp, or lamps and ballast(s) (when applicable), together with the parts designed to distribute the light (reflector, lens, diffuser), to position and protect the lamps, and to connect the lamps to the power supply (also referred to as fixture).

20. “Lux” means the International Systems of Units (SI) unit of illuminance. One lux is one lumen per square meter. A lux is a unit of incident illuminance approximately equal to one-tenth footcandle.

21. “Mounting height” means the height of the photometric center of a luminaire above grade level.

22. “Outdoor lighting fixture” means a luminaire outside of an enclosed building or structure or any luminaire directed such that it primarily illuminates outdoor areas.

23. “Shielding” means an opaque or solid material that blocks the transmission of light.

24. “Sky glow” means the brightening of the nighttime sky that results from scattering and reflection of artificial light by moisture and dust particles in the atmosphere. Sky glow is caused by light directed or reflected upwards or sideways and reduces one’s ability to view the night sky.

25. “Spotlight” means a fixture designed to light only a small, well-defined area.

26. “Time switch” means an automatic lighting control device that controls lights according to time of day.

27. “Uplight” means, for an outdoor luminaire, lux radiated in the hemisphere at or above the horizontal plane.

28. “Vertical illuminance” means illuminance measured or calculated in a plane perpendicular to the site boundary or property line. (Ord. 3178 § 2, 2016)