1. Small size (low): The LED lamp head should adapt to the installation space of traditional lamps, and the LED power supply is generally installed in the lamp head, outdoor power supply ，so the volume should be small.
2. High reliability: The power supply is the source of LED lights, and the reliability requirements are certain.
3. Low cost: A major obstacle to the popularization of LED lighting is cost. Before the cost of LED chips has fallen to people's psychological expectations, the cost of LED power must be carefully calculated.
4. High efficiency: LED lamps with high luminous efficiency should find a "matching" power supply.
5. Good waterproofness: outdoor LED lighting applications such as street lamps have to withstand the test of rain and snow.
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