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Derby Downtown Lighting & Signage Plan

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LOCAL ROAD (INTERMEDIATE) PHOTOMETRIC CALCULATIONS<br />

N<br />

Depiction of photometric calculations that represent acheivable light levels when fixtures are spaced according to the specified design recommendations.<br />

LOCAL ROAD INTERMEDIATE<br />

IESNA STANDARD<br />

Avg. Uniformity<br />

Illuminance Ratio<br />

0.6 fc 6:1<br />

PER GUIDELINES<br />

Avg. Uniformity<br />

Illuminance Ratio<br />

1.0 fc 5:1<br />

Photometric calculations assume a fixture spacing of 100 feet on center,<br />

with fixtures on one side of the roadway as shown.<br />

<strong>Derby</strong> <strong>Lighting</strong> & <strong>Signage</strong> <strong>Plan</strong><br />

137

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