A modular assembly for a headlight includes at least one semiconductor light module having at least one semiconductor light source mounted on a cooling element, having at least one ball socket in which the semiconductor light module is mounted and configured to be pivoted about a ball socket center, a curved cup formed in the cooling element and configured to be mounted in the ball socket, and a guide shell arranged between the curved cup and the ball socket. A method for adjusting the semiconductor light module is also disclosed.