JW-SZ1601

The solar garden light that I just bought is very bright when I first started using it. However, after a long time of use, the brightness of the lamp gradually becomes low until it is extinguished.

We all know that the life of solar garden lamps is slowly shortening, and when one day is completely unlit, it will be dead. Many people can't help but wonder why there are such a process for lamps. What is the cause? In fact, this is the problem of light decay of lamps. Simply put, lamps and human bodies, with the increase of service life, lamps The functional mechanism is constantly falling. Whether it is incandescent, fluorescent, or LED lights, the problem of light decay cannot be avoided.

The light decay of a luminaire means that after a period of illumination, the light intensity of the luminaire will be lower than the original light intensity, and the lower part is the light decay of the luminaire. Different types of lamps cause different causes of light decay.

Ordinary incandescent lighting

Lighting fixtures, incandescent bulbs

For ordinary incandescent lamps, the larger the bubble shell, the smaller the light decay, that is, proportional to the evaporation of tungsten to block the light output. The gas bulb will be relatively light due to the partial gas blocking the evaporation of the tungsten filament.

If the same filament is used for incandescent lamps, it is made in different sizes of bulbs. Relatively speaking, the light decay at the same time point is indeed smaller than that of the small bulb. In addition, the same bubble is filled, the bulb of the large glass bulb has a large internal space, and the gas convection to the bulb has a relatively large heat dissipation area. The temperature of the relatively small bulb lamp is much lower, the temperature of the filament is relatively low, and the luminous efficiency is low. The evaporation rate of the silk is also low, so the light decay is small.

Fluorescent light decay

Incandescent lamps cause light decay due to the size of the bulb and the amount of evaporation of the tungsten filament. The cause of the light decay of the fluorescent lamp is relatively complicated, which is generally caused by the following reasons:

1. Phosphor degradation, solar garden lamp manufacturers in the process of fluorescent light, ultraviolet light will cause the phosphor to produce a color center, resulting in a new absorption band in the lamp, so that the brightness of the phosphor is attenuated.

2. The formation of the light absorbing film, after a long period of discharge operation, a black light absorbing film is formed on the surface of the phosphor, and the presence of the light absorbing film causes a decrease in light output.

3. When the lamp is blackened, when the fluorescent lamp is working, there will be a large amount of mercury ions or mercury atoms on the surface of the glass tube. The mercury ions will exchange ions with other ions in the glass tube. After many years, the glass tube will be blackened. This causes the light to appear in the fluorescent lamp, which affects the luminous efficiency.