This standard covers dimensional, maintenance and light distribution features that permit the interchange of enclosed side-mounted luminaires for horizontal-burning high-intensity discharge lamps used in roadway and area lighting equipment. Luminaires of similar size, shape, and weight meeting the requirements of this standard may be used interchangeably within a system with assurance that:

• They will fit the bracket arm

• Pole strength requirements will not change

• Light distribution will be similar

• Similar maintenance procedures can be used

Luminaires covered by this standard are generally elliptical in shape with lenses that meet the requirements of ANSI C136.17.

Excluded from this standard are luminaries having rectilinear and round shapes.