A total of six hazardous substances listed in ROHS, including Pb, CB, Hg, Cr6+, PDBE and PDD. Becausecar led bulb belong to the electronics industry, it also needs solder, and solder contains lead, while the package of the led car light products contains cadmium. If limited these hazardous substances to minimum standards, it will be far-reaching meaning to car led lamps products. Less solder will make led car light off welding and virtual welding, which impacts much on the stability and pass rate of the entire led car light products and make a greater welding technology requirement on workers. Increased cost makes the price of led car light increase, which makes led car lights more expensive for the original price of led car light is so high. Though car led lights have many advantages, consumers would prefer opting halogen and HID lamps rather thanled car lights