I usually practice calligraphy at night, because that is when I have time. However, I noticed my latest watercolor practice did not turn out so well when I practiced at night.
Lighting may not matter so much with calligraphy, since I practice with black ink. Working with brush pens is ok too, since the color is a significant contrast from the paper.
I think I prefer natural light when working with watercolors. With watercolors, small differences matter, which may be more difficult for me to see under artificial light. I am new to watercolors, so I just might need more experience before I can figure out what happens under artificial light.
Do you prefer to practice during the day with natural light, or at night under artificial light? Do you think it makes a difference?