Thermal conductivity is what everyone is concerned about: the faster the heat dissipation, the longer the product’s service life. The thermal conductivity of the copper-based PCB board is as high as 300W—450W. Copper-based PCBs are mostly used in car headlights, taillights, and other devices that require high heat dissipation; aluminum’s heat dissipation and thermal conductivity can only reach 1W—2W, and the cost is relatively low, so most of them are used in indoor lighting.