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LED is a semiconductor component, the core is composed of p-type and n-type semiconductor chip. There was a transition, called the pn junction between the p-type semiconductor and n-type semiconductor. Can be achieved when a sufficiently large number of carriers injected into the pn junction, the effect to conver t electrical energy into light energy. Low-power LED products with low energy consumption, small size, fast response time, a variety of light color output, long life and does not contain environmentally harmful mercury. LED cold light source, LED light efficiency is low, the need to enter large amounts of energy in high light efficiency / luminous efficiency (lumens per watt or lm / W) Led downlights lighting applications, to convert into light. High current in a semiconductor material conductivity resistance heat, coupled with the production of semiconductor materials ...