Morrisville Unified Development Ordinance - May 2020

Article 5: Development Standards Section 5.15. ExteriorLighting 5.15.3. Vehicle Use Area andOutdoorLighting Light Levels

Table 5.15.3: Light Levels and Uniformity Ratios for High Pressure Sodium (HPS) and Metal Halide (MH) Lighting

Light Level (foot-candles) [1][2]

Average Light Level to Minimum Light Level Uniformity Ratio

Type of Lighting

Maximum

Average

Minimum

Anchor Tenant in a Major or Neighborhood Shopping Center

n/a

4.0

0.2

4:1

Loading Dock

n/a n/a

3.0 3.0

0.2 0.2

4:1 4:1

Group Living, Multifamily, Nonresidential VUA

Vehicle Sales

20.0 20.0

n/a n/a

0.2 0.2

5:1 4:1

Vehicular Canopy

Notes: n/a = not applicable [1] Maximum and average light levels shall be a horizontal measurement at grade or ground level of light level points on a ten-foot by ten-foot point-by-point layout grid in the overall lighted area. They shall be a not-to-exceed value measured or calculated using only the area of the site intended to receive illumination. [2] Measurements and calculations for a new system (after 100 hours of burn-in) shall be multiplied by a maintenance factor of not greater than 0.72 foot-candles for high pressure sodium lighting and 0.64 for metal halide lighting to determine compliance with the standards in this table. For example, if a maximum point measurement of 23 foot-candles was taken on a vehicle sales lot for a new metal halide lighting system, then 23 x 0.64 = 14.72 foot-candles. Exterior light levels for Lighting Emitting Diode (LED) lighting shall comply with standards in Table 5.15.3.B: Light Levels and Uniformity Ratios for Light Emitting Diode (LED) Lighting, for the type of lighting. Table 5.15.3.B: Light Levels and Uniformity Ratios for Light Emitting Diode (LED) Lighting B. Light Levels and Uniformity Ratios for Light Emitting Diode (LED) Lighting

Average Light Level to Minimum Light Level Uniformity Ratio

Light Level (foot-candles) [1][2]

Type of Lighting

Maximum

Average

Minimum

Anchor Tenant in a Major or Neighborhood Shopping Center

n/a

3.0

0.2

4:1

Loading Dock

n/a n/a

2.25 2.25

0.2 0.2

4:1 4:1

Group Living, Multifamily, Nonresidential VUA Lot

Vehicle Sales

15.0 15.0

n/a n/a

0.2 0.2

5:1 4:1

Vehicular Canopy

Notes: n/a = not applicable [1] Maximum and average light levels shall be a horizontal measurement at grade or ground level of light level points on a ten-foot by ten-foot point-by-point layout grid in the overall lighted area. They shall be a not-to-exceed value measured or calculated using only the area of the site intended to receive illumination. [2] Measurements and calculations for a new system (after 100 hours of burn-in) shall be multiplied by a maintenance factor of not greater than 0.85 foot-candles to determine compliance with the standards in this table.

(Ord. No. 2016-001, 05/10/2016)

Morrisville, NC

May 26, 2020 Page 5-143

Unified Development Ordinance