A SMD LED Module is a type of LED module that use Surface-mount technology(SMT) to mount LED chips on printed circuit boards (PCB). It is a self-contained Surface-Mount LED device designed either to function on its own or to plug into a compatible unit. The types of SMD LED Modules are distinguished by the dimensions of the LED chips. Common types are 5050 SMD LED Module, 3528 SMD LED Module, 3020 SMD LED Module, 5630 SMD LED Module. SMD LED Modules are widely used for backlighting, Illuminations, Advertising, automobile Interior Lighting etc.