When I first used it, the courtyard lamp I just bought was very bright. However, after a long time of use, the brightness of the bulb will gradually decrease until it finally goes out.
We all know that the life of the courtyard lamp is gradually shortening. When it's completely shut down in one day, it dies. Many people can't help but wonder, why does the light bulb have such a process, and why? In fact, at the end of the day, it's a matter of light attenuation. In short, a lamp is like a human body. The function mechanism is declining. No matter incandescent lamp, fluorescent lamp or solar lightLED lamp, the problem of light attenuation cannot be avoided.
The light attenuation of the lamp means that after a period of illumination, the light intensity of the lamp will be lower than the original light intensity, and the lower part is the light attenuation of the lamp. Different types of lamps have different reasons for light attenuation.
For ordinary incandescent lamps, the larger the bulb, the smaller the light attenuation, which is proportional to the deposition of tungsten evaporation, thus preventing the light output. Gas filled bulb, because part of the gas to prevent evaporation of tungsten wire, so the light attenuation will be relatively small.
If incandescent lamps use the same filament and are made of bulbs of different sizes, the light attenuation at the same time point is that the large bulb is smaller than the small bulb. In addition, it's full of bubbles. The large bulb has a large internal space, and the gas convection with the bulb has a relatively large heat dissipation area. The relatively small bulb has much lower temperature, lower filament temperature and lower luminous efficiency. The evaporation rate of the filament is also low, so the light attenuation is very small.
The quality of LED products
The quality of LED chips used is not good, and the brightness attenuation is faster.
There are defects in the production process, and the heat of LED chip can not be well dissipated through the pin pin, which leads to the high temperature of LED chip and the increase of chip attenuation.
Problems of service conditions
LED is driven by constant current and some LED lights are driven by voltage, which will cause led to decay too fast.
The driving current is greater than the rated driving condition.
Light attenuation is a necessary process of courtyard lamp. When selecting lamps, the lamps with better quality and heat dissipation performance should be selected as far as possible. In the use process, the workload of lamps should be reduced as far as possible to delay the lighting. Attenuation rate, prolong lamp life.
