ILS Extrusion Heat Sinks. This is a range of linear heat sinks with accessory kits from Intelligent LED Solutions (ILS). These heat sinks have been designed for us with DURIS P5 blue light engines and a remote phosphor lens. This combination of blue light engine and remote phosphor creates a white light output.. The extrusion heat sink kits contain: Alloy heat sink Remote phosphor lens 2 x end caps 4 x screws