mercury vapor lamp
(47) Mercury vapor lamp.— (A) In general .— The term “mercury vapor lamp” means a high intensity discharge lamp in which the major portion of the light is produced by radiation from mercury typically operating at a partial vapor pressure in excess of 100,000 Pa (approximately 1 atm). (B) Inclusions .— The term “mercury vapor lamp” includes clear, phosphor-coated, and self-ballasted screw base lamps described in subparagraph (A).