Abstract: An incandescent lamp for use in a reflector is provided. The incandescent lamp comprises an envelope with a longitudinal axis, at least one filament and electrical lead-out wires. The lamp has a support portion receiving the envelop, a sleeved optical disc associated operatively with the support portion. The sleeved optical disc has a cut-out in a mantle thereof. A plastic base belongs to the incandescent lamp anchoring the sleeved optical disc and includes terminals. A leaf-spring is bent substantially to an O-shape and located in a space defined by the mantle of the sleeved optical disc. The leaf-spring includes a tongue protruding from one portion of the O-shape. The leaf-spring has two end portions forming a tab protruding from another portion of the O-shape. The leaf-spring is pressed to an inner portion of the mantle of the sleeved optical disc at the tab so that the tongue extends through the cut-out in the mantle of the sleeved optical disc.