COB LED vs SMD LED: Which One to Choose for Your LED Lighting Needs?
COB chips typically have nine or more diodes concentrated in a single area. They all have one circuit and two contacts, regardless of the number of diodes. SMD LED chips can contain up to three diodes on a single chip. Each chip has its own circuit that has a cathode and an anode. As a result, the chip has 2, 4, or 6 contacts.