Today. LED lightings are around us everywhere in our daily life, more and more lightings are replaced by LED( light emitting diode) solutions. since LED lighting has lower power consumption, longer lifespan and more energy efficiency compare to the traditional lighting bulbs. In PCB industry. when we say LED PCB( LED pcb board, LED circuit board, LED pcb board, LED printed circuit board) it refers to the PCBs printed circuit boards) that used for LED lighting applications.