Protec LED - Ø174mm, IP20 Recessed downlighter with ABS housing and bezel, zinc plated spring steel fixing clips, anodised aluminium reflectors. LE3 - Lithium Emergency LS3 - Lithium Selftest LA3 - Lithium Autotest Emergency Lumen Values: No Coloured Ring: Opti-Spec: 367, Opti-Sat: 357 Drop Glass Ring: Opti-Spec: 344, Opti-Sat: 335 IP44 Cover: Opti-Spec: 343, Opti-Sat: 333 Microprism Diffuser: Opti-Spec: 274, Opti-Sat: 263 Opal Diffuser: Opti-Spec: 262, Opti-Sat: 243 S - Switch Dimming D - Digital Dimming (DSI) A - Digital Addressable Lighting Interface (DALI) C - Bi-Level Dimming (Corridor Function)* Replace * with WH for white ring or GY for Grey