If you are using a Cree 6 bulb, then these are worth buying. The Cree bulbs are held in with tabs mounted on the bulb. The trim ring is mounted on the bulb as well, so these are just a fixture with a loose socket inside. You screw the bulb to the socket, then slide it up into the fixture till the trim ring is flush to the ceiling. The tabs hold it in place. A simple half turn releases the tabs, and the bulb comes out.