Abstract: A luminaire, and in particular an arm-mounted spotlight or a picture light, having a long slim stem with a lighting head at one end and fixing elements at the other end. The fixing elements have clamping ends which engage at least partially around the stem and which can be operated by hand between a clamping position and a loosening position. In one embodiment, the clamping elements are each formed as clamping sleeves which embrace the stem annularly and have open ends which have flanges which can be moved toward each other by a finger grip in order to achieve the clamping action. In another embodiment, clamping elements are biased into a closed position by a spring and finger grips are provided to open the clamping elements when pressed.