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Relative Test Test conducted with calibration to manufacturer's rated lamp lumens

Absolute Test Test conducted with calibration to NIST standards.

Axially Symmetric Test A symmetric distribution will appear as a circular cone at the outermost edge of the polar plot (e.g. Downlights, Hibays, Lowbays, Vertical Burn Area Luminaires).

Bilateral Symmetric Test A distribution is considered bilaterally symmetric when it mirrors over the 0-180 horizontal plane. The right and left halves of the plane will be the same (e.g. Type I, II, III, and IV Area Luminaires, cove).

Quadrilateral Symmetric Test A quadrilaterally symmetric distribution will present a horizontal cone that is symmetrical in each of the 4 quadrants of the polar plot. The horizontal cone may be square, elliptical, or irregular; however, each quadrant is exactly the same as the other three. The distribution is the same in all quadrants on the plot (e.g. T.V. Square, Type V Area Luminaires).

Asymmetric Test An asymmetric distribution presents a horizontal cone that contains no symmetry or one that is symmetrical in a manner not described by the symmetrical distributions described previously. No two quadrants are the same. (This fixture is highly uncommon.)