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126 <br />( l) No Dynamic Display may exceed a maximum illumination of ~ 4 .500 nits <br />(candelas per square meter) during daylight hours and a maximum illumination of ~ 450nits <br />(candelas per square meter) between dusk to dawn as measured from the sign's face at maximum <br />brightness. <br />(2) All Dynamic Displays having illumination by means other than natural light must <br />be equipped with a dimmer control or other mechanism that automatically controls the signs <br />brightness to comply with the requirements of this Section. <br />(3) No Dynamic Display may be of such intensity or brilliance that it interferes with <br />the effectiveness of an official traffic sign, device or signal. <br />(4) The owner or controller of the Dynamic Display must adjust the sign to meet these <br />brigh tness standards in accordance w ith the C it y's instructions. The adjustment must be made <br />immediately upon notice of non-compliance from the City. <br />(5) A written certification from the sign manufacturer that light intensity has been <br />preset to conform to the brightness levels established by the City's code and that the preset level <br />is protected from end user manipulation by password protected software or other method. This <br />would offer the advantage of ensuring that electronic signs at a minimum cannot exceed the <br />standards. The sign manufacturer must submit this certi fication at t he time of Sign Penn i ~ <br />issuance that the sign has the mechanical ca abilities to control luminance at the le\'els noted in <br />(I) above. <br />(P) Non-Conforming Signs. Dynamic Display Signs existing on . 2014 must <br />comply with the operational standards listed herein. An existing Dynamic Display Sign that <br />does not meet the structural requirements as outlined in (B) and (C) above may continue as a <br />non-conforming development. An existing Dynamic Display Sign that cannot meet the <br />minimum size requirements in clause E) must use the Jar est size ossible for one line of copy <br />to fit in the available space. <br />(Q) Prohibited Signs. Dynamic Display signs shall not be used to display a listing of <br />tenant names, nor can they create distractions which are detrimental to the public health, welfare <br />and safety as determined by the City Manager. <br />§ 155.i930 DISTRICT SCHEDULES. <br />Signs shall be permitted as set forth in the following provisions: <br />(A) Residential. The following signs are permitted in a residential district: <br />(1) R-1 , R-JA, and R-2.