All city-owned exterior flood lighting, including but not limited to street and security lighting but not including era or period lighting which has a minimum efficiency rating of fifty-eight lumens per watt and not including stadium or ball park lighting, shall be replaced, when worn-out, exclusively with high pressure sodium lighting or lighting with equivalent or better energy efficiency as approved in rules adopted by the utilities board within the utilities division of the department of commerce. In lieu of the requirements established for replacement lighting under this section, stadium or ball park lighting shall be replaced, when worn- out, with the most energy-efficient lighting available at the time of replacement which may include metal halide, high- pressure sodium, or other light sources which may be developed.
89 Acts, ch 297, §6; 91 Acts, ch 253, §16; 92 Acts, ch 1233, §3
Referred to in § 474.5
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