LED lighting mostly use low-voltage LED light source (LV LEDs), low forward voltage VF was 3.2 ± 0.2V, the forward current, IF, nominal current 350mA/1W or 700mA/3W. Therefore, the switching constant current source, the resulting system circuit power factor loss, increase in system circuit ripple; traditional lamp left us very little room, the drive power of the LED light source is difficult to do well in small spaces ; LED lighting must be attached AC to DC (AC / DC) power conversion systems, the rectifier large buck to high-voltage LED lights source power supply, power loss, the overall power efficiency is difficult to improved; system circuit transformer coupled and resistance accuracy error, and the driver IC with degrees tend to make the transformer manufacturing parameters with the theoretical values vary greatly; removal of the drive power supply ripple and electrical energy storage aluminum electrolytic capacitors, low life expectancy of aluminum electrolytic capacitors became difficult to go beyond the divide of the long life of LED lamps; High-voltage LED lights beads cooling function, conduction-cooled, must use a radiator, limited due to space and cooling difficulties, the whole lamp LED cooling is still a huge bottlenecks; LED light bead, poor heat dissipation, and not timely will result in the LED light bead early light fades; use heat sink will increase the cost of led high bay lighting and its own weight. . . Although the difficulties of that sort of LED lighting design engineers in efforts to improve, but the pursuit of excellent product performance and product cost control has been in a dilemma.