(A) Before issuance of a certificate of occupancy or within 30 days of receiving a certificate of occupancy, the applicant or designated agent shall submit to the city a plan indicating the installed lighting level measurements to demonstrate compliance with this chapter. The plan and data shall be prepared by a lighting certified designer, certified testing laboratory or licensed electrical engineer and contain the applicable professional seals and stamps. Meter and measurement requirements are as follows.
(1) Meter required. Lighting levels shall be measured in footcandles with a direct reading portable light meter with a color and cosine corrected sensor with multiple scales. The meter shall read within an accuracy of plus or minus 5%. It shall have been tested and calibrated by an independent commercial photometric laboratory or the manufacturer within one year of date of use as attested to by a certificate issued by such laboratory.
(2) Horizontal method of measurement. The meter sensor shall be mounted not more than six inches above the ground level in a horizontal position at the property line. Readings shall be taken only after the cell has been exposed to provide a constant reading. Measurements shall be made when the meteorological optical range is six miles or further so that measurements will not be adversely affected by atmospheric scatter. Measurements shall be made after dark with the existing questioned light sources on, then with the same sources off. This procedure eliminates the effects of moonlight and other ambient light. The difference between the two readings shall be compared to the footcandle ratings listed in the table in § 97.02(E).
(3) Vertical method of measurement. The meter shall be mounted at five feet above ground level in a vertical position, perpendicular to the property line and facing the lighting in question. Readings shall be taken only after the cell has been exposed to provide a constant reading. Measurements shall be made after dark with the existing questioned light sources on, then with the same sources off. This procedure eliminates the effects on moonlight and other ambient light. The difference between the two readings shall be compared to the footcandle ratings listed in § 97.02(E).
(4) Computation of illumination. Illumination at a point may be computed in lieu of measurement. Computation methods shall consist of a generally accepted Illuminating Engineering Society method, using certified photometric data furnished by the luminary manufacturer, lamp manufacturer, photometric laboratory, or other reliable authority satisfactory to the city. Computations shall be based on new properly seasoned lamps, new and clean luminaries, and at rated voltage and wattage, with ballasts, lenses, shields, diffusers, and other appurtenances in place, and proper regard taken for mounting height, relative elevation, natural and manmade objects.
(Ord. O-2008-025, passed 9-9-08)