Elisian - Ø320mm, IP40 Recessed downlighter with spun aluminium housing, four point steel spring mechanism and opal diffuser. Options: E3 - Emergency control gear (433 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) R24H - Reacta 24H, Minihead Daylight and Presence Detection Sensor EA - Reacta Air Wireless occupancy and daylight dimming