Nonstandard obstruction lights shall provide equal intensity specified air-approved light assemblies in all angles of which two measures?

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Viewing angle coverage is what matters for obstruction lights. To ensure equal intensity from every direction, the specification uses two angular coordinates: azimuth, which covers the horizontal plane around the obstacle, and elevation, which covers the vertical angle above the horizon. The light assemblies must show the same luminous intensity at all azimuth and elevation angles within the approved fields of view. Distance isn’t an angle and doesn’t describe brightness variation with direction, and while inclination can be related to elevation, the standard terms used for aviation lighting are azimuth and elevation.