Portland City Code ch. 14

Citation: Portland City Code ch. 14 1.
Parent Document: Portland City Code ch. 14
Jurisdiction: Portland (municipal)
Original Source: https://www.portlandmaine.gov/asset/ae8cabd1-66eb-4a1c-9224-92bbca5e792f ↗

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1. Externally-illuminated signs must be 2. Electronic message signs must not flash,
illuminated only with steady, stationary, blink, flutter, include intermittent or
fully-shielded light sources directed solely chasing lights, or display video messages
onto the sign without causing glare. (i.e., any illumination or message that is in
2. The light source for externally-illuminated motion or appears to be in motion).
signs must be arranged and shielded to Electronic message signs may display
substantially confine all direct light rays to changing messages provided that each
the sign face and away from streets and message is displayed for no less than 30
adjacent properties as illustrated in Figure seconds.
20-A. 3. Electronic message signs must be
equipped with photocell technology to
control and vary the intensity of light
output 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 in 100 percent full white mode.
4. The applicant shall provide a written
FIGURE 20-A: EXTERNAL ILLUMINATION certification from the sign manufacturer
D. Direct illumination. All direct illumination that the night time luminance has been
must be turned off daily at the close of factory pre-set not to exceed 100 nits as
business or 10 p.m., whichever occurs last. described in (3) above, and that this setting
E. Neon. Exposed neon sign lighting must be is protected from end-user modification by
turned off daily at the close of business or password-protected software or other
10 p.m., whichever occurs last. method as deemed appropriate by the
F. Single-color or two-color LED signs. Building Authority.
1. Single or two-color LED signs are exempt 5. Electronic message signs must be turned
from the sign area limitations for window off daily at the close of business or 10 p.m.,
signs and building-mounted signs. whichever occurs first.
2. Single or two-color LED signs must be
turned off daily at the close of business or 20.7.4 Changeable sign copy
10 p.m., whichever occurs last. Changeable sign copy must comply with the
G. Electronic Message Signs following standards:
1. One electronic message sign is allowed per A. Maximum area. The maximum area of
lot. changeable sign copy shall be limited to 50% of 20-14 | CITY OF PORTLAND LAND USE CODE SIGNS

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