4" PLUS Trimless Iolite downlights have no exposed flange and do not extend beyond the ceiling plane. Iolite PLUS Trimless requires a PLUS Trimless Mud Ring and New Construction housing. Deep regressed cone reflector optimizes visual cut-off. Required Trimless Mud Plate: NIO-TLMR-4PR Compatible Housing: NHIOICD-4PS15, NHIOICD-4PS20, NHIOICD-4PS25, NHIOICDCP-4PS15, NHIOICDCP-4PS20, NHIOICDCP-4PS25 Lumens / Wattage: Up to 2500lm / 28W (varies by housing) Color Temperature: Comfort Dim (3000K-2000K) Color Rendering Index: 90 CRI Beam Spread: Three field changeable optics included Finish: White Listing: cULus listed for wet locations Accessories: NIO-AS, NIO-HC