UDO_Adopted Version_February 2025-BAC Updated 4.29.25

Article 5: Development Standards Section 5.15. Exterior Lighting 5.15.3. Vehicle Use Area and Outdoor Lighting Light Levels

5.15.3. Vehicle Use Area and Outdoor Lighting Light Levels

A. Light Levels and Uniformity Ratios for High Pressure Sodium (HPS) and Metal Halide (MH) Lighting Exterior light levels for high pressure sodium (HPS) and metal halide (MH) lighting shall comply with standards in Table 5.15.3, Light Levels and Uniformity Ratios for High Pressure Sodium (HPS) and Metal Halide (MH) Lighting, for the type of lighting. 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. B. Light Levels and Uniformity Ratios for Light Emitting Diode (LED) Lighting 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

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

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. [3] Greenhouse/Nursery, Research use shall be exempted from this table. If located within the Airport Overlay A or Airport Overlay B districts, all outdoor lighting shall comply with UDO Section 3.8.2.4.

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

Morrisville, NC

July 9, 2024 Page 5-141

Unified Development Ordinance