Lamp with a reflector and adjustable holder for a radiator

is connected, the invention relates to a luminaire (1) having a radiator (3) and an adjustable holding device (5) by which the radiator (3) having a base part (2) of the lamp (1), wherein the holding device (5), an elongate support element (6), a retaining element (7) at least for a part of the radiator (3), a joint (8) (between the support element (6) and the retaining element (7) and a clamping device (9) for locking of the joint 8), wherein the joint (8) and the clamping device (9) in a radiator housing (11) are arranged. To ensure a manipulation-friendly adjustability of the radiator (3), in the spotlight housing (11) has a release device (41) is arranged, with which the clamping force of the clamping device (9) can be reduced or canceled, whereby the release device (41) for its manual operation of is outside the spotlight housing (11) accessible forth.