1)Column Heat Pipe Heat Sink,Short and thick copper heat pipe,2)High bay light heat sink,heat transfer,heat dissipate Specifications:1,Watt:40W,60W,80W,100W ... performance. 2,Copper column-shape heat pipe Aluminum LED heat sink,Bonded fins,Zipper fins and extruded finsFeature:heat pipe+copper base+aluminum fins 3 ...