p5 outdoor LED module.LED's epoch-making dimming for energy conservation

　　Since humans realized that every effort must be made to save energy and reduce emissions in order to solve the urgent problem of atmospheric warming, how to reduce lighting electricity consumption has become an important issue on the agenda. Because lighting electricity accounts for 20% of the total energy consumption. Fortunately, efficient and energy-saving LEDs have emerged. LEDs themselves are more than 5 times more energy-efficient than incandescent lamps, and are also about twice as energy-efficient as fluorescent and energy-saving lamps. They do not contain mercury like fluorescent and energy-saving lamps. If dimming can still be used to save energy, it is also a very important energy-saving method. But in the past, all light sources were difficult to achieve dimming, and easy dimming is a major advantage of LEDs. Because in many situations, it is not necessary to turn on the lights or at least not so bright, but the lights are turned on very bright, such as the street lights from midnight to dawn; The lighting inside the subway carriage when driving from underground to suburban ground; It is more common for fluorescent lights in offices, schools, factories, etc. that are close to windows when the sun is shining brightly. I don't know how much electricity these places waste every day! In the past, high-pressure sodium lamps, fluorescent lamps, ceiling lamps, and energy-saving lamps couldn't be dimmed at all, so it had to be ignored. After switching to LED, you can easily adjust the light, and this electrical energy can be completely saved. So for dimming lamps, home wall dimming is not the main application, and the market is also very small. On the contrary, it is the on-demand dimming of streetlights, offices, shopping malls, schools, and factories that is more important. Not only is the market huge, but it also saves energy significantly. These occasions require not manual dimming but automatic dimming and intelligent dimming.

　　Dimming of streetlights

　　Generally speaking, street lights are of little use after midnight, so the usual practice is to turn them off or turn them on at half brightness after 12 o'clock. However, the most reasonable approach is to control the brightness of street lights based on traffic flow, or even fully adaptive control of brightness.

　　To achieve this intelligent dimming, it is actually very simple. As long as the curve of the traffic flow statistics in this area is inputted into a microcontroller, and the PWM dimming signal is given based on this curve to a constant current driving source, it can be achieved.

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