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Article 5: Development Standards
Section 5.15. Exterior Lighting
5.15.4. Fixture Requirements
June 23, 2017
Morrisville, NC
Page 5-144
Unified Development Ordinance
a.
Cutoff where full cutoff is required; and
b.
Other fixtures deemed architecturally non-compatible by the Planning Director.
The color and style of the fixture shall complement the architectural character of the building.
The light pole cannot be greater than 35 feet in height above the ground level at its base. Raised
foundations are permissible where appropriate for parking.
Light levels shall comply with the standards in Section
5.15.3, Parking and Outdoor Lighting Light Levels.The maximum light level shall not exceed
one-half the horizontal maintained foot-
candles of light trespass at any residential
property line.
Service connections for all freestanding
fixtures shall be underground.
D.
Covered Parking
Garage parking facilities shall be lighted to
IESNA recommendations outlined in Table
5.15.4.D:Light Levels and Uniformity Ratios for
Covered Parking, for the type of lighting.
Table
5.15.4.D:Light Levels and Uniformity Ratios for Covered Parking
Type of Lighting
Minimum Horizontal
Light Level [1]
Maximum Horizontal
Light Level to Minimum
Horizontal Light Level
Uniformity Ratio [3]
Minimum Vertical Light
Level [4]
Lux Foot-candle [2]
Lux Foot-candle [2]
Basic [5]
10
1
10:1
5
0.5
Ramps [6]
Day [7]
20
2
10:1
10
1
Night
10
1
10:1
5
0.5
Entrance
Areas [8]
Day
500
50
10:1
250
25
Night
10
1
10:1
5
0.5
Stairways
20
2
10:1
10
1
Notes:
[1] Measured on the parking surface, without any shadowing effect from parked vehicles or columns. For preliminary
design, an average value of 50 horizontal lux (5 horizontal foot-candles) for basic illuminance (and equivalent for other
conditions) may be calculated.
[2] Rounded conversion of lux to foot-candles.
[3] The highest horizontal illuminance area, divided by the lowest horizontal illuminance area, shall not be greater than the
ratio shown.
[4] Measured at 1.5 meters (5.0 feet) above parking surface at the point of lowest horizontal illuminance, excluding facing
outward along boundaries.
[5] For typical conditions. While these values are intended to address personal security issues, some retailers may increase
them to further offset perceived concerns. Top levels of garages open to the sky shall not exceed 0.5 foot-candles minimum
with a maximum to minimum uniformity ratio of 15:1 horizontal and 0.25 foot-candle minimum vertical illuminance (source
IESNA 9
th
edition handbook). The mounting height on the top level of a garage shall not be greater than 22 feet above the
parking deck top floor, including raised foundations, and the light fixture classification shall be full cutoff.
[6] Applies to clearway ramps (no adjacent parking) but not to sloping floor designs.
[7] Daylight may be considered in the design calculation.
[8] A high illuminance level for about the first 20 meters (66 feet) inside the structure is needed to effect a transition from
bright daylight to a lower internal level.
E.
Loading Docks
Fixtures shall be full cutoff.
Figur
e 5.15.4.D:Anchor Tenant Covered Parking.