The development of LED lighting products using high voltage LED lighting, AC / DC power transformer, without resistance, the overall power consumption can be greatly reduced using a small current is thereby significantly reducing the design requirements of the thermal shell. High-voltage blue 1W LEDs for example, the forward voltage drop of up to 50V, that it is only 20mA drive current output power of 1W, low voltage LED forward voltage drop is 3V 1W LED requires 350mA drive current to output 1W power, the power dissipation of the high-voltage LEDs of the same output power at work is far lower than the low-voltage LED, which means that the cost of cooling the aluminum casing can be greatly reduced. The high-voltage LEDs can bring the lower of cost and weight of high voltage LED lighting, but more importantly, the significance of significantly reducing the cooling system design requirements, which will effectively cleared the LED lighting into the indoor lighting mass market is the biggest technical obstacles.
The HV LED application circuit for the LEDs and the LV can be very clear from Figure 5, the LV the LED in the LED lighting must use the AC / DC drive constant current power supply, because the LV LED VF = 3.2V, IF = 350-700mA;the HV of the LEDs in the led high bay lamps should be only one AC / DC rectifier bridge pile and a current regulator diode, because its VF = 50-270V, IF = 20mA; very small compared to the costs and space.