A printed circuit board having an upper face provided with contact traces and pads with a light-emitting diode fixed to the board and connected to the traces. A connector juxtaposed is with the pads and carries a contact element having a leg bearing with spring force on one of the pads and formations gripping a hookup wire. At least one fastener engages through the connector and circuit board with a heat-sink base and presses the connector against the circuit board and the circuit board against the base.