Elisian Medium - Ø223mm, IP40 Recessed downlighter with polycarbonate housing, four point steel spring mechanism and microprism diffuser. Options: LE3 - Lithium Emergency (419 lumens) LS3 - Lithium Selftest LA3 - Lithium Autotest S - Switch Dimming D - Digital Dimming (DSI) A - Digital Addressable Lighting Interface (DALI) C - Bi-Level Dimming (Corridor Function) R44 - Daylight regulating and Occupancy Sensor RAS - Reacta Air Wireless occupancy and daylight dimming RCS - Reacta-Control Wireless Sensor RLS - Reacta-Link Wireless Sensor BL - Black Housing WH - White Housing