Directly illuminated signs are prohibited in the AG Agricultural, R-1, R-2, R-3, R-4 and R-5 Residential, I-1 General Industrial and I-2 Light Industrial Zoning Districts. Wherever permitted, any illuminated sign, including a directly or indirectly illuminated sign, or lighting devices, shall employ only lights emitting a light of constant intensity, and no sign shall be illuminated by or contain flashing, intermittent, rotating or moving light or lights or produce direct glare beyond the limits of the side property line. Colored lights of such shape and hue that they may be confused with official traffic lights and signals shall be prohibited. All bare incandescent light sources and immediately adjacent reflecting surfaces shall be shielded from view.