D.C. Mun. Regs. tit. 31, r. 31-1501
No person shall sell, install, repair, or adjust taxi dome lights or other equipment relating to the operation of a dome light for use on any licensed taxicab in the District of Columbia without a valid dome light installation business license issued by the Commission, which is in addition to the Basic Business License required by D.C. Official Code § 47-2851.04. The foregoing notwithstanding, a person possessing a valid Taximeter Business or Taxi Smart Meter System Business or Taxi Smart Meter System Business license issued by the Commission shall not be required to submit a separate application for a dome light installation business license. However, such person shall otherwise comply with the requirements of this chapter, including the payment of all license fees and the submission of a separate bond, as required by section 1503 of this chapter.
D.C. Mun. Regs. tit. 31, r. 31-1501