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Nowadays, there are more and more LED street lights in cities, and traditional street lights with high-pressure sodium lamps as light sources are gradually being replaced. However, the quality level of LED street lights on the market is uneven, so it is very important to choose an LED street light with excellent quality. And LED street light power supply is an important part of LED street light. When we choose LED street light, its power supply must meet these four requirements:
1. LED street light power supply must be constant current
The characteristics of the lighting material of LED street lights determine its impact on the environment. For example, if the temperature changes, the current to the LED will increase. Also, the voltage of the LED will increase. If the long-term operation exceeds the rated current, the service life of the LED lamp beads will be greatly shortened. The constant current of the LED street light power supply is also the current value that ensures its operation when environmental factors such as temperature and voltage change.
2. LED street lamp power constant current accuracy
Some power supplies on the market have poor constant current accuracy, the error may reach ±8%, and the constant current error is too large. The general requirement is ±3%. According to 3% design. The production power supply should be fine-tuned to achieve ±3% error.
3. LED street lamp power supply working voltage
The recommended working voltage of general LED is 3.0-3.5V. After testing, most work at 3.2V, so it is reasonable to calculate based on 3.2V. The total voltage of N lamp beads in series = 3.2 * N.
4. Appropriate working current of LED street light power supply
For example, an LED street light has a rated operating current of 350 mAh. Some LED street light manufacturers use it at the beginning, with a design of 350 mA. In fact, the operating heat at this current is very serious. After many comparison tests, the design of 320mA is more suitable, which can minimize heat and convert more power into visible light.
The LED street light power supply can be regarded as a qualified power supply if it meets the above four requirements. In addition, when choosing LED street lights, we should not only pay attention to the power supply, but also fully understand the other components that make up LED street lights, so that we can choose high-quality LED street lights.