Lighting for outdoor recreational facilities shall be so designed, installed and operated as to confine at least 90% of the illumination to the recreational area. Recreational facility fixtures shall be on elevated poles or structures so that illumination is directed downward. No significant illumination may extend above a horizontal plane from the lighting fixture. For aerial sports (e.g. baseball, softball, football, tennis, golf) luminaires shall not be aimed above 60° from vertical. The height of recreation facility lighting shall be set at the minimum height needed to provide the effective illumination of the outdoor recreation facilities in accordance with the IESNA standards.