Finned heat sink is mainly used for the driver module or PCB. This product is suitable for small power consumption (usually under 9W) with certain ventilation environment or lower heat dissipation requirements.
Extruded heat sink provides a great range of natural convection solutions for high power components and systems. Complex fin structures can be created by forcing raw aluminum through an extrusion die. These complex fin profiles allow bigger heat dissipation by increasing surface area, and eliminating the cost and time associated with machining an equivalent shape from block aluminum.