Btec Secure Downlighter - IP65, IK10, Recessed downlighter with spun aluminium housing, spring steel retaining clips and high transmission polycarbonate diffuser. When installed with anti-pick mastic to seal the luminaire to the mounting surface the BTEC Secure complies with ligature resistant requirements of the Department of Health Environmental Design Guide, Adult Medium Secure Services. Lighting control options: S - Switch Dimming D - Digital Dimming (DSI) A - Digital Addressable Lighting Interface (DALI) C - Bi-Level Dimming (Corridor Function) H - High Frequency Dimming (Analogue 1-10v) RLI - Reacta-Link, Wireless Enabled Luminaire RC - Reacta-Control, Wireless Enabled Luminaire Emergency options: LE3 - Lithium Emergency LS3 - Lithium Selftest LA3 - Lithium Autotest