Must be one thousand ways since human consciousness to energy conservation and emissions reduction, in order to solve the urgent problems of atmospheric warming, how to reduce the light just mentioned the agenda as an important problem. Because lighting electricity accounts for 20% of total energy consumption. Fortunately, the high efficiency and energy saving of LED, LED itself over 5 times of energy than incandescent bulbs, energy-saving than fluorescent lamps, energy-saving lamps, also a times, also don't like fluorescent lamps, energy-saving lamps, mercury. If you still can use dimmer to energy saving, so is also very important means of energy conservation. But in the past all the light source is not easy to realize the dimmer, and easy to move light LED is a great advantage. Because in many occasions actually don't need to turn on the light or at least don't need that bright, very bright, but the lamp, such as in the middle of the night to dawn time of street lamp; Subway car from underground to ground when the car in the suburbs of the floodlight; More common is near the window when the sun is shining offices, schools, factories and other fluorescent lights are still open in there. These places don't know how to waste electricity every day! In the past because of high pressure sodium lamp, fluorescent lamp, absorb dome light, energy-saving lamps can not move light, also can forget it. After switching to leds, can freely move light now, this electrical energy can be saved completely! So for lamps and lanterns that move light, family wall dimmer is not the main applications, the market is very small. But the street lamp, office, shopping malls, schools, factories according to the need to move light is more important occasions, not only market is huge, and energy saving. These occasions need instead of manually adjustable light auto dimming, intelligent dimmer!
 
1 lamp dimming
 
In general, street lamp beyond midnight is useless, so usually it was 12 o 'clock and then turn off the lights or half brightness. But the most reasonable approach is based on traffic flow to control the brightness of the lamp, or even completely adaptive control of brightness.
 
And in order to realize the intelligent dimmer, is actually very simple. As long as the region's traffic flow statistics curve into a single chip microcomputer, according to the curve of PWM dimming signal source can be achieved to the constant current driver.
 
2 light automatically dimming LED lights
 
In order to reduce unnecessary lighting, in strong sunlight can be used in a photosensitive automatic dimming LED fluorescent lamp (or any other LED lamps and lanterns).
 
The role of the photosensitive element is feeling around the sun, the stronger if the sun will output a PWM signal to all close to the sun (such as the LED fluorescent lamp) LED lamps and lanterns, to dim the brightness of the them. A signal generator can be adjusted by a lot of LED lamps and lanterns that move light, as long as these lamps and lanterns of constant current driver with PWM dimming control interface. The dimming system itself efficiency is as high as 92%. And there is no wall thyristor dimmer compatibility issues. This automatic adaptive light is any energy saving fluorescent lamp, energy-saving lamp, high-pressure sodium lamp and so on gas discharge tube can not realize, and is the LED lamps and lanterns is best.
 
The future LED dimming system development route
 
1 PWM dimming
 
Have already said in front of the LED dimming it is best to use PWM dimming, using PWM dimming, can be installed in the switch on the wall of a simple PWM generator, then use potentiometer to control PWM work than so as to realize the dimmer. But if we have to turn off the lights bright out, you will need to add a couple of lines. So I can't compatible with the original wall of thyristor switch fuses. Only 2 original of thyristor switch fuses, can again the dimmer switch. This advantage is difficult to compatible. But actually the most commonly used lamps and lanterns that move light a lamp or floor lamp, the dimmer switch are installed on the power cord is not in the wall, and you can't have to take advantage of the two leads in the wall. That is to say, PWM adjustable light can be directly applied to the dimmer type desk lamp.
 
2 sectional dimmer switch
 
Taiwan has a company launched a call EZ - Dimming GM6182 four switch that move light can yet be regarded as a good solution. It only use ordinary light switch on the wall can achieve four period of dimmer, the first time for the whole light, the second open 60% brightness, the third open 40% brightness, fourth with 20% brightness. This system has the advantage that can use the ordinary wall switch that move light. And the power factor up to more than 0.92. Not produce interference signals were evident. Defect is not continuous adjustable light. There are some trouble operation.
 
3 remote call light
 
Using infrared remote control LED dimming. This, of course, is the ideal solution. Can realize open to turn off the lights, and using PWM dimming. Disadvantage is high cost, no unified specifications, can only be used for high-grade residential.
 
In fact, we should think back our what's the main purpose of that move light should be. All previous mentioned dimming the objective is to meet people that occupy the home need different light intensity in different situation. Watching TV may be darker, for example, when reading could be brighter. These are mostly in the house. There are very few offices, shopping malls, factories, schools that move light lamp. And the vast majority of these places is installed fluorescent lamp, energy-saving lamps, also impossible to move light or it is difficult to realize continuous adjustable light.