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for this problem, in fact, the first thing we want to know, SMD leds is also belong to one of the LED diode. Common led two or four pins, there is no needle foot, close to the circuit board copper foil welding, are the same. In addition, the lamp bead have a pin, and there is a resin cap, outside because of cap LED diode can be concentrated; Patch without pin, outside also have no similar resin cap, because of no cap LED strips can't concentrating.
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