S&B1 418 PR T8 Surface Mounted Acrylic Diffuser Luminaire 4x18w Housing High quality cold-rolled steel sheet. Reflector 99.85% high purity anodized aluminium reflector mirror finished (DIN 5036-2) for normal usage. Diffuser high quality acrylic diffuser with steel painted frame. With spring-lock type frame 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 surface mounted or suspension rod installation. Application Recommended for commercial buildings, hospitals, laboratories , schools, etc.