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Example total initial luminaire lumens for a light commercial site in a prescriptive method compliance chart.

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• Meeting Planning and Zoning Commission Meeting — Agenda Packet (2020-11-24)Nov 24, 2020p.13raw: 247,840

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  Example total initial luminaire lumens for a light commercial site in a prescriptive method compliance chart.

  In this example, three types of luminaires are used to light a parking area and building entry in a light commercial area. Two of these three luminaires use metal halide lamps: 70 watt wall mounted area lights and 150 watt pole mounted area lights. For these, the Initial Luminaire Lumens is equal to the initial lamp lumens multiplied by the luminaire efficiency. These values are entered into the compliance chart. The lumen value for the building mounted LED luminaires is equal to the lumens exiting the luminaire. Therefore, the value already represents the Initial Luminaire Lumens and no luminaire efficiency is needed. The total Luminaire Lumens for the site is equal to 247,840. The allowable lumens are based on the lighting zone and the total hardscape area. Referencing Table B, the allowed lumens are 2.5/SF for LZ2. Multiplying this by the total hardscape square footage gives a value of 250,000 lumens allowed. Because this value is greater than the value calculated for the site, the project complies.

  Reasoning: This is a reference/example value for total lumens, not a city financial figure.