Abstract: A beacon lamp comprising a base, a support member fixed in relation to the base and a reflector carrier rotatably mounted on said support member for rotation relative thereto about a first axis. A drive motor carrier is resiliently supported by said support member such that in a rest position the principal axis of the motor carrier is disposed at a small angle to said first axis. An electric motor is supported by said drive motor carrier, and has its output member engaging a cylindrical wall of said reflector carrier, said motor carrier being deflected during positioning of said motor such that said principal axis is rendered substantially parallel with said first axis and said carrier resiliently biases the motor output member against said cylindrical wall of said reflector carrier.