LED chip size can be divided into small power chip, medium power chip and high power chip according to the power. According to customer requirements can be divided into single pipe level, digital level, dot matrix level and decorative lighting, etc. As for the specific size of the chip is based on the actual production level of different chip manufacturers, there is no specific requirements. As long as the process passes, the small chip can increase the output per unit and reduce the cost, the photoelectric performance will not change fundamentally. The current used by a chip is actually related to the current density flowing through the chip. The current used by a chip is small, while the current used by a chip is large, and their unit current density is almost the same. Considering that heat dissipation is the main problem of large current, its luminous efficiency is lower than that of small current. On the other hand, as the area increases, the volume resistance of the chip will decrease, so the forward guide voltage will decrease.