There are obvious differences between LED and COB LED. These differences are mainly reflected in the following aspects:
1. Chip usage: LED integrated light sources usually use large-sized and high-power LED chips of more than 1 watt, and the chip size is generally more than 30MIL. COB light sources are mainly low-power LED chips of less than 1 watt, and a very small amount of COB light sources also use high-power LED chips of more than 1 watt.
2. Use of brackets: The brackets used by LED integrated light sources are only 10W, 100W, 500W and other square brackets. The materials are mainly copper, and the brackets have two side feet. The brackets used by COB light sources come in many sizes, and their shapes include dozens of brackets of different sizes such as square, rectangular, and oval. The materials are mainly aluminum, but there are also brackets made of copper and ceramics. Generally, they are Without side legs.
3. Application fields: LED integrated light sources are mainly used to make outdoor lamps such as LED floodlights and LED street lamps. The maximum wattage of a single unit can reach 500W. COB light sources are mainly used in indoor lamps such as LED downlights, track lights, and ceiling lights, and their maximum wattage per unit does not exceed 50W.
In addition, LED and COB LED are also different in manufacturing process and packaging form. LED is a semiconductor solid light-emitting device that uses a solid semiconductor chip as a light-emitting material. When a forward voltage is applied to both ends, the carriers in the semiconductor recombine and cause photon emission to produce light. COB LED adheres the bare chip to the interconnection substrate with conductive or non-conductive adhesive, and then conducts wire bonding to realize its electrical connection. There are three packaging forms: strip, square and round.
In general, LED and COB LED are different in the use of chips, use of brackets, application fields, manufacturing processes and packaging forms. These differences give them different application ranges and characteristics in the lighting field.