Recessed lighting, also known as recessed downlight, downlight, floodlight or recessed fixture, emits downward distribution of light and provide effective accent, task or ambient light to any room. Recessed lighting fixture is composed of recessed can, trim and reflector.
Selecting the right LED light bulbs for recessed lighting are based on can housing aperture width and types of reflectors and housing structures. Recessed lighting comes in these can housing aperture widths/ diameters: 3", 4", 5" or 6"; and these types of reflectors and housing structures: full reflectors, adjustable eyeball tilt reflectors, open housing with no reflectors or dome reflectors.
Before selecting LED light bulbs that would best fit your recessed lighting fixture, please refer to label affixed inside the recessed can or instruction manual for the recessed lighting, which recommends the type of light bulbs (eg. PAR20 for 4" recessed can) and maximum wattage of light bulb to be used with the recessed lighting.
More information regarding which LED light bulbs to use for Recessed Lighting: http://www.agreensupply.com/categories/LED-Home-Lighting/Recessed-%284%22-Can%29/