Title: Gisela 8-light Antique Black Rectangle Crystal Chandelier This light is not damp rated. Whether it is dimmable or not depends on the light bulb not on the light fixture itself. If you use dimmable light bulb and a dimmer switch, it will be dimmable. This fixture does need to be hard wired. Assembly is required. Professional installation is recommended. This light can be installed on a sloped or vaulted ceiling.