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shielding angle
complementary angle of the cut-off angle
Note 1 to entry: The shielding angle is the angle measured from the horizontal, down to which the light source(s) is (are) screened by the luminaire.
Note 2 to entry: The shielding angle is expressed in radian (rad) or degree (°).
Note 3 to entry: This entry was numbered 845-10-31 in IEC 60050-845:1987.
Note 4 to entry: This entry was numbered 17-1172 in CIE S 017:2011.