What problems will the LED dimming application encounter?

The task of responding to light decay by dimming is really easy for traditional light sources, but not for current LED light sources. First of all, adding dimming means that the cost is greatly increased. Some people say that LED can be thyristor dimming, but is it really safe? Can stability be solved? Why are there only a few 1-10V DMXs so far? Only Philips dares to do the dimming MR16, and other manufacturers do not? In addition, has there been any increase in the calculated cost? No dimming drive power, a few tens of dollars for 15 watts, and at least 50 for dimming.
Figure: Common thyristor dimming principle
Conventional dimming can not be adjusted if the smoothness of the change is not high, but smooth adjustment is needed in hotels and other occasions. During the construction, we will also encounter the error of the instruction transmission. For example, our drawings are very clear, we must put the weak signal line, and the result is not put on the scene. What should I do? Can only use thyristor dimming, often such a situation, the current electrician, many do not look at the weak electrogram. By adding dimming, not only to cope with the purpose of light decay, but also to automatically adjust the aisle illumination by equal spacing, the starting point of these applications is good.
Photo: Guangzhou W Hotel facade facade lighting. For the large-scale use of LED array lighting on the facade of the building, it is necessary to code and identify different lamps, so that when the lamp fails, the new lamp can be replaced by dimming to reduce the power to the same as other lamps that are reasonably used. Brightness levels to avoid jumps in performance due to new fixtures.
If the passages and rooms of a hotel are dimmed in this way, the relative cost is too high, but a tunnel in a city may be of great value: I have a brother, who was under the Yangtze River four years ago. Through the tunnel, thousands of lights from start to finish, using the power IC to adjust, equivalent to each power supply has a CPU, a light and an address, you can control the output power of each lamp, thus achieving dimming. From the outside to the inside of the tunnel, the human eye has a process of brightness contrast adaptation, so the illumination requirements for different positions of the tunnel are different. At the beginning, higher illumination is required and gradually weakened, so the wattage requirement for the lamp is also Not the same, the entrance may be 400 watts, perhaps 100 watts in the middle. Then, the change of outdoor weather and the change of time in the day will make the illumination contrast different. The adjustment requirements of the contrast are further differentiated. This makes the use of seven wattage lamps in the tunnel, controlled by single lamp. A dozen or twenty scenarios have been implemented.
Figure: From the outside to the inside of the tunnel, the human eye has a process of contrasting the brightness. Therefore, the illumination requirements for different positions of the tunnel are different. At the beginning, higher illumination is required and gradually weakened. Moreover, as the brightness of the external environment changes, the illumination distribution in the tunnel also needs to be changed at the same time.
Using dimming to solve light decay, product quality issues are more important than how to dim the solution
This problem is raised by the method of dealing with LED light decay, so here is the point of responding to the light decay. I think that for products with conscience, there is no need to worry about its light decay problem. Only when inferior products are selected. At the time, its light decay can be obvious to let you discover that this is a horrible thing. At the application level, if the dimming system is already in use, it can be adjusted every two years to adjust the power from 50% to 70% to maintain the original concept. But if you choose a poor quality LED product, then it doesn't matter.

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