Will the brightness of the constant photographic lamp get lower and lower?

The lights will definitely dim, but not as fast as you said, in a year or two. There are several reasons for darkness. The camera settings of 1 are the same, but the photometric results of the camera are different for different items, unless the M file is used. The distance between the light and the object is different, so the brightness is different and there is an angle. In addition, Jinbei is the production of flashlights.