The luminance of LED is determined by the luminance of bare core of LED chip and the appearance of lamp body package. Its life is determined by the working environment and quality of LED chip. In particular, the standard sizes of LED chips used in LED lighting products are: red, yellow, 12mil, blue and green 14mil, but also 8-10mil chips. The brightness of a chip of different sizes can be the same, but its lifetime is completely different, because the larger the charge per unit area, the shorter its lifetime. This is also why luminescent diodes are priced differently.