Okla. Stat. tit. 61, § 156
In the event that any public building area cannot meet the lighting power limit, such area may be deemed in compliance if it meets the lighting provisions of the Model Code. In all cases, the burden of proof of meeting the provisions of the Model Code shall rest with the management of that public building.
Laws 1979, HB 1177, c. 234, § 6, eff. October 1, 1979.