The Halo surface mount LED downlight (SMD) is an low profile surface mounting luminaire with a modern look and high performance. SMD4 (4 in.) is designed for installation in many 3-1/2 and 4 in. square, octagon or round junction boxes. Supply wire adapter with LED quick wiring connector included. The SMD4 may also retrofit in 4 in. aperture IC and non-IC recessed housings.