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Courtyard lamp is mainly composed of 5 major components, namely:light sourceLight source is an important part of all lighting products, according to different illumination requirements, can choose different brands, different types of light source and light source commonly used are: incandescent lamp, energy-saving lamp, fluorescent lamp, sodium lamp, metal halide lamp, ceramic metal halide lamp, and a new type of LED light source. Characteristics of each light source:1 incandescent lampVisible photoelectric radiation generated by the heat excitation of an incandescent light emitting finger. In