20 watts 5 m solar street light

Now more and more city LED street lamps, high pressure sodium lamp as light source of the traditional street lamp is gradually replaced. But the LED lights on the market at present the quality level is uneven, so choose a good quality LED street lamp is very important. And LED street lamp power is LED road

now, LED street light in the city is becoming more and more traditional street lamp with high pressure sodium lamp as light source are gradually being replaced. However, currently on the market of LED street light quality level is uneven, so choose a good LED street lamp is very important. LED street lamp power supply is an important part of the LED street lamp. When we choose our LED street light, the power supply must meet the four requirements: first, the power of the LED lights must be constant current characteristics of the LED street lamp lighting material determine their impact on the environment. For example, if the temperature changes, light emitting diode current will increase. In addition, the light emitting diode voltage will increase. If long-term running more than rated current, light emitting diode will shorten the service life of pearl. LED street lamp power supply, constant current and environmental factors, such as temperature, voltage changes to ensure the operation of current value. Second, LED street lamp power supply, constant current precision constant current precision of some power supply on the market, error may reach several times; 8%, the error of constant current is too large. General requirements: 3%. According to 3% of the design. Production of power supply should be fine-tuning to diversify; An error of 3%. 3. The working voltage of led street lamp power supply generally light-emitting diodes (leds) recommend the working voltage of 3. 0 - 3. 5 v。 。 After the test, most of the work in 3. 2 v, so based on 3. 2 v calculation is reasonable. The total voltage on a series of n light bead = 3. 2 * n。 Four. The suitable working current of led street lamp power supply, for example, the rated working current of led street lamp is 350 mah. Some leds lamps manufacturers began to use it, designed to 350 ma. In fact, the working temperature is very high. After a lot of contrast test, the design of 320 ma is more appropriate, can minimize heat, will be more electric energy into visible light. Only when the led street lamp power supply to meet the above four requirements, is a qualified power supply. In addition, when choosing led street light, we must not only pay attention to the power supply, and fully understand the other part of the led street light, so as to choose high quality led street light.