When light painting photography, won't the camera expose the light painter

Theoretically, it will be recorded, but it can't be seen because of the exposure setting.

For example, general light painting should be set to an exposure time of more than 30 seconds. People are constantly moving in the process of painting, so even if they are recorded, they are some virtual shadows and can't see the specific images.

Therefore, it is very important to control exposure by taking light painting, which requires recording the trajectory of light movement, and the virtual shadow of character movement should not be too obvious.