LT 118 WS T8 L-Type Acrylic Diffuser Luminaire 1x18w Housing High quality cold-rolled steel sheet Diffuser high quality acrylic diffuser with steel painted frame Lamp Holder Heavy duty spring-locked type lamp holder (TIS.344-1987 Standard) other lamp holder typs are available , WR = Rotary-locked type lamp holder (G13) Wire Cable THW 1.0 sq.mm. 70'C (TIS.11-1988 Standard). Optional: 105'C 18AWG UL Standard. IP Rating IP20 Installation suitable for general purpose with high efficiency requirement