LED daytime driving lights, the most important point is the distribution of optical properties, DRL to meet the requirements of the basic brightness, but it can not be too bright, so as not to interfere with others. Reflected in the technical parameters is reference axis of the luminous intensity of not less than 400 CD, the other direction on the luminous intensity should not be less than 400 CD and with light distribution graph of the corresponding points of percentage of product, in any direction, sent by the lamp light intensity should not more than 800 CD.