It is widely used in cities. We usually just say that led street lamps are good, but the disadvantages are. In fact, its light is more dazzling than traditional street lamps. LED street lamp manufacturers need to adopt dimming treatment before leaving the factory. So what is the dimming method of led street lamp?

The first type: This dimming method includes dimming the LED lamp by modulating the driving current of the LED. Since the brightness of the LED chip is proportional to the driving current of the LED, we can control the LED light by adjusting the driving current of the LED. Light and dark.

The second type: this dimming method is called analog dimming method or linear dimming method. The advantage of this dimming method is that when the driving current linearly increases or decreases, the impact on the LED chip life during the drive current overshoot is reduced, and the dimming circuit has a strong anti-interference capability. The disadvantage is that the process of changing the driving current must have a certain impact on the color temperature of the LED chip.

The third type: This dimming method is called pulse width modulation (PWM). The method comprises adjusting the driving current to a square wave, varying the pulse width, and modulating the pulse width to modulate the continuous illumination time of the LED lamp. At the same time, the input power is changed to achieve power saving and dimming. Goals. The frequency is generally about 200Hz10KHz; Due to the lag of human vision, the light source will not feel the brightness phenomenon produced in the process of dimming. The advantage of this dimming method is that it can improve the heat dissipation performance of LED, but the disadvantage is that excessive driving current will certainly have a certain impact on the life of LED chip.