LED light bulbs come in different categories according to the type of chip used. The three types are dual-inline package (DIP), surface-mounted diode (SMD), and chip on board (COB). The SMD variety of LED light bulbs is the most common, but COB LED light bulbs offer very bright light with less energy consumption. DIP LED bulbs were the original type and are still used today, but less frequently in consumer lighting applications than the other two types.