Under normal circumstances, the same lamp will have several different specifications model, lamp volume from small to large, can be installed in the battery plate and lithium iron phosphate battery size is also different, the larger the battery plate can generate more electricity, the larger the lithium iron phosphate battery, the more electricity it can store, and thus the greater the power of the light source. The different shape of the lamp body is to meet the aesthetic requirements of different customers. The different size of the lamp body is to meet different road widths, light pole height and customer requirements for different brightness and choose.