Lever Nuts are great for attaching ceiling fixtures. Your home wiring uses a solid cable, while the light fixture usually has a stranded cable. You can twist on a wire nut, but i've had problems with making a good contact between the stranded and solid cable. These Lever Nuts make it easy for such a scenario especially when you're struggling to hold the fixture and wire it at the same time. It also makes it great for fluorescent light ballasts where you can similarly prep the replacement ballast at floor level and then quickly and easily make the final connection at the ceiling. These absolutely beat wire nuts for any light fixtures that you might ever replace.Lever nuts and Push wire connectors also work for electrical junctions and saves some space compared to standard wire nuts, however, I usually use wire nuts for more permanent connections like that.Also, the Wago product lines all have UL-US, UL-Canada, European code compliance and even are approved for use on American and European ships.Step by step for ceiling fixtures:1.) strip and prepare all wires2.) while fixture is on floor, attach lever nuts to all stranded wires and press levers down to secure3.) lift fixture up to ceiling box4.) insert solid wires into lever nut and press lever down to secure, repeat for other wires5.) (OPTIONAL) twist wires to further secure5.) mount light fixtureBOOM! Done!