10.764 Glare.
In all districts, any operation or activity producing glare shall be so conducted that direct or indirect light from the source shall not have a maximum permitted illumination in excess of 0.5 footcandles on any property in a residential district, other than the lot on which the glare is generated. This section is not intended to apply to public street lighting.
(1) Definitions. Candlepower: The amount of light that will illuminate a surface one (1) foot distant from a light source to an intensity of one (1) footcandle. Maximum (peak) candlepower is the largest amount of candlepower emitted by any lamp, light source, or luminaire.
Footcandle: A unit of illumination produced on a surface, all points of which are one (1) foot from a uniform point source of one (1) candle.
Glare: The brightness of a light source which causes eye discomfort.
Maximum Permitted Illumination: The maximum illumination measured in footcandles at the interior buffer-yard line at ground level in accordance with the standards of Subsection 4 below.
Post Height: The distance measured from the grade at the base of the light post to the top of the light fixture.
(2) Exemption for Specified Outdoor Recreational Uses. Because of their unique requirements for nighttime visibility and their limited hours of operation, lighting for ball diamonds, playing fields, and tennis courts is exempted from the exterior lighting standards of Subsection (4) below. Exterior lighting for outdoor recreational uses must meet all other applicable requirements of this section and of this code.
(3) Maximum Lighting Height for Specified Outdoor Recreational Uses. Notwithstanding height limitations elsewhere in this code, exterior lighting for the outdoor recreational uses specified in (2) above shall be permitted a maximum post height of ninety (90) feet. When a Conditional Use Permit is required for the specified outdoor recreational uses, additional height limitations may be imposed to meet approval criteria.
(4) Additional Regulations. Notwithstanding any other provision of this section to the contrary:
(a) No flickering or flashing lights shall be permitted.
(b) Light sources or luminaires shall not be located within bufferyard areas except on pedestrian walkways.
(5) Measurement. When required, the measurement of lighting levels shall be conducted by the developer and certified by a licensed engineer that the measurements have been conducted as per the following:
(a) Metering Equipment. Lighting levels shall be measured in footcandles with a direct-reading, portable light meter. The meter shall have a color and cosine-corrected sensor with multiple scales and shall read within an accuracy of plus or minus five (5) percent. It shall have been tested, calibrated, and certified by an independent commercial photometric laboratory or the manufacturer within one (1) year of the date of its use.
(b) Method of Measurement. The meter sensor shall be mounted not more than six (6) inches above ground level in a horizontal position. Readings shall be taken by qualified personnel only after the cell has been exposed long enough to provide a constant reading. Measurements shall be made after dark with the light sources in question on, then with the same sources off. The difference between the two readings shall be compared to the maximum permitted illumination and property line at ground level. This procedure eliminates the effects of moonlight and other ambient light.
(6) Exterior Lighting Plan. At the time any exterior lighting is installed or substantially modified an exterior lighting plan shall be submitted in order to determine whether the requirements of this section have been met. The lighting plan shall identify:
(a) Location of light fixtures
(b) Type of luminaire
(c) Height of luminaire
(d) Maximum illumination
(e) Cut-off angle