Dobbins JLUS IMP Public Draft Light Pollution Study | Page 116

M ulticolor Changeable-Copy LED Sign Lighting Standards. Lighting for multicolor
changeable-copy LED signs must meet the following:
5.3.
Table 5.4 ILLUMINATED SIGN CURFEWS
Land Use Zoning and Sign Type
Curfew
Commercial and Industrial zoning
O paque Background
10pm
Colored Background
10pm
Light Background
8pm
All residential and mixed--use zoning
O paque Background
9pm
Colored Background
9pm
Light Background
6pm
A. [ALTERNATIVE A] Multicolor changeable-copy LED signs must include photocell
technology to control and vary the intensity of lighting depending on the amount of
ambient light that is present to prevent overly bright luminance at night: automatic
controls must limit night luminance to a maximum of 100 nits when the display is set
to show maximum brightness white (100% full white mode). The applicant shall
provide a written certification from the sign manufacturer that the nighttime light
intensity has been factory pre-set not to exceed this level, and that this setting is
protected from end-user modification by password-protected software or other
method as deemed appropriate by the Planning Director.
Note to Table 5.4
Multicolor Changeable--Copy LED
D
Land Use Zoning refers to the predominant use of land by area within 1,000 feet of the
parcel on which the sign is located.

Section 6. Special Uses.
6.1.


Figure 5.3.A Multicolor changeable-copy LED sign
[ALTERNATIVE B] Multicolor changeable-copy LED signs are not permitted.
5.4. Curfews. Illumination for all on-site advertising signs except billboard s, both externally
and internally illuminated, shall be turned off at the curfew times listed in Table 5.4 or
when the business closes, whichever is later. Signs subject to curfews are required to have
functioning and properly adjusted automatic shut-off timers. Light background (white, off-
white, light gray, cream or yellow) internally illuminated signs , installed legally before
enactment of this code [enter date], may continue to be used and illuminated but must
conform to the curfews as indicated.
Recreational Facilities.
A. Class of Play: Fields designed primarily for use by municipal or amateur leagues,
training, recreational or social levels, shall be considered Sports Class IV as defined by
the Illuminating Engineering Society of North America (IESNA). Fields designed
primarily for college, semiprofessional, professional or national levels shall be
considered Sports Class I , Sports Class II or Sports Class III as defined by IESNA.
B. Lighting Amount: Lighting for outdoor athletic fields, courts or tracks shall be exempt
from the total outdoor light output standards of Section 4.2.
C. Shielding: fully shielded lighting is required for fields designed for Sports Class III and
Sports Class IV levels of play. Facilities designed for Sports Class I and Sports Class II
levels of play shall utilize luminaires with minimal uplight consistent with the
illumination constraints of the design. Where fully shielded fixtures are not utilized,
acceptable luminaires shall include those which:
1. Are provided with internal and/or external glare control louvers and installed so as
to minimize uplight and offsite light trespass, and;
2. Are installed and maintained with aiming angles that permit no greater than five
percent (5%) of the light emitted by each fixture to project above the horizontal.
D. Illuminance: All lighting installations shall be designed to achieve no greater than the
110% of the minimal illuminance levels for the activity as recommended by the
Illuminating Engineering Society of North America (IESNA) for the Sports Class as
described in Section 6.1.A.
Page A- 48
Appendix A:
White Paper – Communities Addressing Light Pollution that Affect Nighttime Military Training