1. Reliability： especially installed at high altitude, maintenance is not easy, also costs are large.
2. Efficiency: For led power supply installed in the structure of the lamp is particularly important, because the LED luminous efficiency with the LED temperature rise and down, High efficiency, its power consumption is small, the heat in the lamp is small, it will reduce the temperature rise of the lamp.
3. Power factor: Although the power is not a small power factor of a single little power on the power grid is not big, but at night we light the load is too concentrated, will produce more serious pollution on the grid. For 30 watts to 40 watts of constant voltage LED driver, will have a certain power factor indicators soon.
