Nanchang lighting, road lighting in industry engineering contractor, how the landscape lighting industry lighting provided by China. Nanchang lighting, road lighting in industry engineering contractor, lighting design project cost is landscape engineering industry in Jiangxi Province Installation Co., Ltd. (www.jxzhongye.com.cn) 2014 Jiangxi been newly introduced in the industry to upgrade the landscape project to install Ltd. , founded in 1994. For 20 years, the industry, adhering to the "Albert Hing China, a human light" corporate mission, to create the industry's well-known "in the industry" brand. In today has grown into a company with many years in the landscape lighting project design, budgeting, construction site management, installation, LED electronic products R & D, manufacturing and sales of high-tech enterprises. Companies with urban and road lighting engineering contractor qualification, special lighting engineering design B qualification, intelligent building three qualifications. LED design basis 1, LED driver power supply design points based on the characteristics of LED landscape lighting engineering qualification, its safe use is driven by constant current type, constant current drive circuit features are: constant current output, and the output of the DC but as the load resistance of the voltage different sizes vary within a certain range, the load resistance is small, the output voltage is low, the greater the load resistance, the output voltage is higher. Attentive readers may find the current landscape lighting construction finished on the main market for LED devices, mostly using a simple capacitor step-down mode, constant current through a capacitor to achieve the role of these products has a fatal flaw, and that is often How can landscape lighting, LED devices all at once will burn at the moment of switching power supply, the reason that caused the capacitor charge and discharge characteristics, and here is the differential circuit capacitor capacitance, resistance, such as light-emitting tube is equivalent to the differential circuit resistor, the time differential circuit parameter t = 0.7RC, the charge and discharge at the moment t, the instantaneous current flowing through the LED great (may be up to several times the normal current even number of times), resulting in permanent moment damage the chip. A higher reliability of the LED drive circuit shown in Figure 1 (compare Used LED series applications): This circuit, C 1 can be omitted, another inexpensive U1 can use diodes instead of the common drawback of this circuit is its low efficiency , when the tens (65 or less) than the arc tube connected in series, the higher the efficiency. The circuit can also be simplified, cancel U1 and C1, Q1 base can be directly connected to the lower end of R1, steady flow of 0.6/R1 decisions taken when R1 30 ohms, a constant current of 20mA. Jiangxi Province in the industry landscape lighting project to install Ltd., founded in 1994. For 20 years, the industry, adhering to the "Albert Hing China, a human light" corporate mission, to create the industry's well-known "in the industry" brand. In today has grown into a company with many years in the landscape lighting project design, budgeting, construction site management, installation, LED electronic products R & D, manufacturing and sales of high-tech enterprises. Companies with urban and road lighting engineering contractor qualification, special lighting engineering design B qualification, intelligent building three qualifications. High quality electrical components high pressure mercury lamp, high pressure sodium and metal halide lamps are gas discharge lamps are lighted when the arc discharge lamp negative voltage characteristics, namely the current increases when the lamp voltage is not increased but decreased must be connected in series with a positive voltage characteristics of components to balance this negative characteristics, with this characteristic element called restrictor or ballast. Currently, the widely used smart lights Saver. High-impedance magnetic ballasts have good stability and voltammetry, high power factor and low power consumption. So as to stabilize the lamp current, extended lamp life. Reducing the power loss is also energy-saving ballast one aspect of the work can not be ignored. 250W sodium lamp ballasts, such as good quality is only 20-25 watts of power loss, power loss and poor quality of up to about 40 watts. If you can pay attention to the choice of high quality products in the supporting ballast, then the energy saving effect is very significant. With lights, for example, mercury and sodium lamps installed in Taizhou City as all supporting ballast are made of high quality products in order to reduce the average power consumption of each ballast 3 watts, 4,000 hours per year-round lighting time, you can saving 60000 kWh.