The yellow / gold color PLCC-4 LED is a vibrant color that you cant go wrong with. 3528 or 1210 is another name that the SMD is commonly known as. This LED is used in many of todays popular electronics. We have seen them used as direct replacements in electronics to simply change the colors. They are also used for custom projects or in mass production products as well.The PLCC4 has 4 pads on it and is an easy way to distinguish the difference between the PLCC4 and PLCC2 LED, which have the same footprint.We use and have only the highest quality leds out there.