This project will involve installing a new light fixture in your home. You will need to purchase the light fixture, as well as any necessary tools and supplies. You will then need to turn off the power to the area where the light fixture will be installed, and remove the existing light fixture.
From Wikipedia
A light fixture, light fitting or luminaire is an electrical lighting device containing one or more light sources, such as light bulbs, and all the accessory components required for its operation to provide illumination to the environment. All light fixtures have a fixture body and one or more light sources. The sources may be in sockets for easy replacement; in the case of some LED fixtures, they may be hard-wired in place.