Helmut Lamp was a member of the German Bundestag for the first time from 1990 to 1998. On 28 March 2000, he succeeded the late Gert Willner as a member of the Bundestag, where he remained until the end of the 14th parliamentary term in 2002. On 18 June 2003, he moved back into the Bundestag as a successor to the retired Member of Parliament Angelika Volquartz and was again a Member of the Bundestag until the end of the 15th parliamentary term in 2005. In the 16th legislative period until 2009, Lamp was again a successor since 20 December 2007, this time for the resigned Member of Parliament Carl-Eduard von Bismarck.

Herbst, Ludolf; Jahn, Bruno (2002). Vierhaus, Rudolf (ed.). Biographisches Handbuch der Mitglieder des Deutschen Bundestages. 1949–2002 [Biographical Handbook of the Members of the German Bundestag. 1949–2002] (in German). München: De Gruyter - De Gruyter Saur. p. 1715. ISBN 978-3-11-184511-1.