The Halo H4 LED is a family of 4 inch aperture recessed downlighthousings designed for exclusive use with Halo EL4, ELG4, ELSG4Series LED Light Engines. Halo H4 LED housings have integral LEDdrivers that offer dimming as a standard feature.H455RICAT120D is an insulated ceiling, AIR-TITE, remodel housingoffering 120 volt dimming capability. Designed for use with EL4series LED Light Engines and TL4 and TLS4 LED Series Trims; andELG4, ELSG4 Adjustable Gimbal Light Engine/Trim combination.The H455RICAT120D offers high quality downlighting along withhigh efficacy, the result being great lighting and significant energysavings.