Elisian - Ø320mm, IP40 Recessed downlighter with spun aluminium housing, four point steel spring mechanism and microprism diffuser. Options: E3 - Emergency control gear (436 lumens output) ST3 - Emergency Selftest AT3 - Emergency Autotest STR - Reacta-Link Wireless Self test 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 Presence & daylight RLS - Reacta-Link Wireless Presence RCS - Reacta-Control Wireless, Presence