A COB LED Module (chip-on-board light-emitting diode module) is a type of LED module that uses surface-mount technology (SMT) to mount LED chips on a printed circuit boards (PCB).

COB modules are a self-contained, surface mounted LED device that is designed either to function on its own or to plug into a compatible unit.

^[1] During assembly, COB modules are usually covered in a yellow, glop-top variant of conformal coating.

^[0]The individual SMD LED modules are mounted in an array which produces a greater amount of lumens with greater heat dissipation, more even light pattern and an overall smaller package than can be accomplished by mounting LEDs individually on a PCB.

^[1] MCOB (multi-COB) is a variant where multiple COB modules are used in one device.

^[2]