1. This section addresses the quality and quantity of lighting associated with proposed developments.
2. All outdoor lighting shall be in conformance with the requirements established herein except those specifically exempted herein.
A. Any luminaire with a lamp rated at more than 1,800 lumens shall not emit, in its installed position, any direct light above a horizontal plane through the lowest direct light emitting part of the luminaire.
B. Lighting of construction projects and outdoor recreational facilities (public or private), including, but not limited to, football fields, soccer fields, baseball fields, softball fields, tennis courts, swimming pools, special event or show areas, shall meet the following conditions:
(1) All fixtures used for such lighting shall be fully shielded or be designed or provided with sharp cut-off capability, so as to minimize up-light, spill-light, and glare.
(2) Illumination of the playing field, court, track, pool, or event site, after midnight is prohibited except to conclude a scheduled event that was scheduled to be completed before 11:00 p.m. that circumstances prevented concluding before 11:00 p.m.
(3) Temporary outdoor light fixtures for uses incidental to construction work shall only be illuminated when construction work is occurring and removed upon completion or abandonment of the construction work.
C. The use of laser source light or any similar high intensity light for outdoor advertising or entertainment when projected above the horizontal plane is prohibited.
D. The operation of searchlights for advertising purposes is prohibited.
E. Legally established nonconforming luminaries may be replaced with a like kind of luminaire unless more than 50 percent of the like kind of luminaires on the same premises are being replaced.
F. All nonexempt outdoor light fixtures shall be designed, installed, and maintained to prevent light trespass and/or mitigate light pollution. Outdoor light fixtures shall be installed and thereafter maintained so as not to cause direct light from the luminaire to be directed toward residential buildings on adjacent or nearby properties and/or land, or rights-of-way. If such condition should occur, the luminaire shall be redirected or its light output shall be controlled as necessary to eliminate such condition.
3. Exempted Light Sources. The following are exempted from this section:
A. Any light source producing 1,800 lumens or less;
B. All temporary emergency lighting needed by emergency services, as well as all vehicular luminaries;
C. All hazard warning luminaires required by Federal regulatory agencies;
D. A building or structure that has been designated for historic preservation by the State of Iowa, or the National Park Service, shall be exempt from the "fully shielded" requirements, if a historic restoration cannot be achieved by other means.