In situations where aesthetics are less important than simply having an easy-to-install bright source of light, like in a shop, garage, basement, or greenhouse, hanging a flourescent light fixture by chains from the ceiling can be a good solution. 48-inch shoplights are the most common and usually the cheapest solution for this type of lighting, and are usually designed to be hung from the ceiling by chains connected to holes on the top of the fixture.
Things You'll Need
2-bulb 48-inch shoplight fixture
2 small steel S-hooks
2 equal lengths of 14-gauge jack chain
2 screw-in eye hooks
Determine how far down you want your light fixture to hang and buy pieces of jack chain of that length. They can cut the chain to length for you at the hardware store.
Measure the distance between the holes on the top of your fluorescent fixture, get on your ladder, mark out that same distance with two dots on the ceiling where you'd like to hang the chain.
Screw the eye-hooks into the dots that you have marked out.
Attach the S-hooks to the bottom of the chains.
Insert the S-hooks into the holes in the light fixture. The use the chains to lift the light fixture into place and hook the chains onto the eye-hooks.