(a) Prohibition Except as provided by subsection (b), on and after January 1, 2009 , a general service incandescent lamp shall not be purchased or installed in a Coast Guard facility by or on behalf of the Coast Guard . (b) Exception A general service incandescent lamp may be purchased, installed, and used in a Coast Guard facility whenever the application of a general service incandescent lamp is— (1) necessary due to purpose or design, including medical, security, and industrial applications; (2) reasonable due to the architectural or historical value of a light fixture installed before January 1, 2009 ; or (3) the Commandant of the Coast Guard determines that operational requirements necessitate the use of a general service incandescent lamp. (c) Limitation In this section, the term “facility” does not include a vessel or aircraft of the Coast Guard . ( Pub. L. 110–140, title V, § 522 , Dec. 19, 2007 , 121 Stat. 1662 .) Statutory Notes and Related Subsidiaries Effective Date Section effective on the date that is 1 day after Dec. 19, 2007 , see section 1601 of Pub. L. 110–140 , set out as a note under section 1824 of Title 2 , The Congress .