NICOR Lighting Dimmable 4000K LED Recessed Downlight Retrofit Kit for 4-Inch Housings, White (DLR4-20-120V-4K-WH) Lifetime of more than 36,300 hours Easy installation 638.0 lumens (compare to a 50W lamp), 4000K warm white light 12.33 watts, or 51.7 lumens per watt Utilizes Cree LED technology