It measures approximately 16 across/diameter. I do not know how long this fixture is, as I did not unpack it. Based on the cord that runs down from the top of the fixture, which has a light socket attached to it to lite up the lower half of the fixture, it should measure no less that 4 tall but I do believe it will be 5' in length. It appears to have 2 sockets for 2 bulbs, one near the top and one near the bottom. It comes with extra shells which are bagged and attached to the top of the fixture.