Designed for sloped ceiling installations for ceilings from 2/12 to 12/12 pitch. The socket aiming mechanism allows the lamp to be aimed straight down in accordance with of ceiling pitch (2/12 to 12/12). H645IC is designed for use in insulated ceilings where the housing will be in direct contact with insulation. H645IC is AIR-TITE® gasketed to limit airflow between conditioned spaces and unconditioned areas.