A overhead light is general lighting, and unless your machine is directly under it, you would cause a shadow where you are working. I like my light a little to the left of where I am. Got mine from JoAnn's. They are at office supply stores, but found they were more costly. It is used for matching color and such.
Artifictial light can distort color.
I just use a standing halogen light for my light I see by. A clamp or desk lamp is a good idea as above poster stated. CA Lori Thank you both. I really liked the way the Ott lamp swiveled all over the place, but the light wasn't bright enough for these aging eyes. I have an Ott light and an overhead light.