Element Surface - 1800mm Surface mounted Luminaire, white powder coated steel body with low glare microprism diffuser. Options: LE3 - Lithium Emergency (332 lumen output) LS3 - Lithium Selftest LA3 - Lithium Autotest A - Digital Addressable Lighting Interface (DALI) H - High Frequency Dimming (Analogue 1-10v) R44 - Daylight regulating and Occupancy Sensor RAS - Reacta Air Wireless Presence & daylight RLI - Reacta-Link Wireless Module RLS - Reacta-Link Wireless Presence RC - Reacta-Control Wireless Module RCS - Reacta-Control Wireless, Presence B - Black Body GY - Grey Body