4" Iolite LED downlights require a dedicated Iolite new construction housing. Adjustable slot aperture focuses the beam spread through 2-5/8" x 2" opening. Adjustability: 25° Compatible Housing: NHIOICD-415, NHIOICD-420, NHIOICD-425, NHIOICDCP-415, NHIOICDCP-420, NHIOICDCP-425 Lumens / Wattage: Up to 2500lm / 28W (varies by housing) Color Temperature: 3500K Color Rendering Index: 90 CRI Beam Spread: Three field changeable optics included Finish: Haze Aperture / Matte Powder White Flange Listing: cULus listed for damp locations Accessories: NIO-AS, NIO-HC, NIO-FMMR-4R