In 1971 Kris De Bruyne joins the duo for a short time, and the group became a trio Lamp, Lazerus & Kris, bringing together hitsingle "De onverbiddelijke zoener / De peulschil".
Despite this success, Kris left the trio in pursuit of a solo career.
He was replaced by Luk Vankessel, but they were unable to achieve the same level of success, and this meant the end of the trio.