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reflectorized bulb
bulb having part of its interior or exterior surface coated to form a reflecting surface to enhance the light in particular directions
Note 1 to entry: Such surfaces can remain transparent to certain radiation, in particular to infrared radiation.
Note 2 to entry: This entry was numbered 845-08-11 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-1072 in CIE S 017:2011.