What are the parameters of the color tone of a SLR night painting and writing, and how to shoot it?

This is a light painting. Camera parameters are generally the lowest iso, f8 and other small aperture and long shutter. It takes about three to five seconds to shoot a letter.

Generally, it takes at least two people, one to shoot and the other to do light painting. The camera must be put on the shelf. Take photographic equipment, light painting tools and lighting tools and find a dark place. First determine the shooting position, set up the machine when there is light, and then turn off the lighting tool to shoot light painting. It must be practiced several times the first time.