An instrument handle (12) for a medical diagnostic light (10), to which a light instrument head (14) can be connected, accommodates or can be connected to an energy source. A manually operable light regulation device (20) is arranged in the instrument handle (12) at least partially behind a lateral wall opening (22) of the instrument handle (12) and is sealingly closed by a cover element (30) that is connected to the instrument handle (12) with material fit. The cover element (30) comprises an operating section (32) that can be manually pressed in and has markings (34) that can be haptically and optically differentiated, wherein the markings (34) are designed in the form of surface depressions and/or surface elevations of the cover element (30). A medical diagnostic light (10) uses the instrument handle (12) and a medical diagnostic device uses the diagnostic light (10).
