Abstract: An underwater light fitting suitable for niche mounting in swimming pools comprises a housing including a casing, a light transmissive portion in the form of a lens, and a removable portion. Inside the housing there is a bulb mounted on a connection member. The removable portion may be removed from the casing to allow easy access to, and thus facilitate replacement of, the bulb, without necessitating removal of the lens. A seal, preferably in the form of a resilient reusable O-ring, may be provided between the removable portion and the casing. In use, the light fitting is connected to a power source by a power transmission cable, and a wet-mateable connection is provided in the cable, enabling the whole housing to be removed to any convenient location for maintenance. The light fitting may include a reflector which may be adjustable so as to allow control over the direction of light emitted from the fitting.