Dobbins JLUS IMP Public Draft Light Pollution Study | Page 255

MODEL LIGHTING ORDINANCE - USER’S GUIDE
MODEL LIGHTING ORDINANCE - TEXT
IV. NON-RESIDENTIAL LIGHTING (cont.) - User’s Guide
IV. NON-RESIDENTIAL LIGHTING (cont.) - Ordinance Text
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.
PRESCRIPTIVE METHOD EXAMPLE - COMPLIANCE CHART
Lamp Descriptions QTY Initial Luminaire Lumens
Total
70 W Metal Halide
150 W Metal Halide
18 W LED
8
20
24
3,920
9,600
1,020
31,360
192,000
24,480
TOTAL INITIAL LUMINAIRE LUMENS
SITE ALLOWED TOTAL INITIAL LUMENS*
PROJECT IS COMPLIANT?
247,840
250,000
YES
* Listed below is the method of determining the allowed total initial lumen for
non-residential outdoor lighting using the hardscape areamethod. (Table B).
SITE ALLOWED TOTAL INITIAL LUMENS
Site Description
Lighting Zone
Hardscape Area (SF)
Allowed Lumens per SF
of Hardscape (Table B)
Site Allowed Total Initial Lumens
(lumens per SF X hardscape area)
Appendix B: Model Lighting
Ordianance
USER’S
GUIDE - Page 13
Light Commercial
LZ-2
100,000
2.5
250,000
ORDINANCE TEXT - Page 13
Page B-13