Outstanding Cooling Performance with Chimney Structure Design Unique chimney structure design allows OC-series to realize excellent cooling performance. The Weight and volume are also reduced compared to normal high bay with same heat dissipation effect. Fast and Effective Cooling Mode IP65 for Wet Location IP65 widens application scope of OC-series. Sleek frame and well-ventilated heat sink avoid dust accumulation. 11 Types of Lighting Distribution Control Options