A lamp module group can include a lamp module including a first terminal, the first terminal including a first contact and a second contact; and a housing including a lamp holder, the lamp module positioned within the lamp holder, the housing including a second terminal positioned within the lamp holder, the second terminal including a third contact and a fourth contact, the lamp holder defining a center axis, the center axis intersecting the third contact, the third contact positioned in electrical communication with the first contact, the second contact coupled in electrical communication with the second contact.