T&F1-W T8 Recessed Double Parabolic Lover Luminaire Housing High quality cold-rolled steel sheet of thickness 0.6 (T6) or 0.8mm (T8) Reflector 99.85% high purity anodized aluminium reflector with Total Reflectance of 87% (87) mirror finished (DIN 5036-2) for normal usage. Optional: TR=95% (95) for high efficiency purpose Louver 99.85% high purity anodized aluminium louver cross blade with Total Reflectance of 87% (87) mirror finished (DIN 5036-2) for longitudinal Standard 2 blades for 18w. And 5 blades for 36w. With spring-lock type for ease of maintenance. Lamp Holder Heavy duty rotary-locked type (TIS.344-1987 Standard) Wire Cable THW 1.0 sq.mm. 70'C (TIS.11-1988 Standard). Optional: 105'C 18AWG UL Standard. IP Rating IP20 Installation For recessed T-bar and gypsum ceiling installation. Application Recommended for commercial buildings, shops, hospitals, department stores , schools, etc.