An age old discussion that can only be satisfied individually, because human eye vision varies. I don't care who says what is best or the expertise of the person. That person does not see and interpret with my eyes, and I don't see an interpret with their eyes. There is no gold standard. Full spectrum, incandescent, tungsten-halogen, fluorescent, LED....it does not matter, except the perception of the person using the light source. Full spectrum is as close to natural sunlight and color spectrum as can be achieved, but it peaks in the blue light spectrum, and that is responsible for glare. Depending on the person, that may or may not be helpful. Halogen may be good for enhancing contrast, and iffy in the color spectrum, from one person to another. Use the lighting that works well for you. Visually impaired persons (and the average person does not know at any one time if they are impaired and to what degree) will interpret differently from a person with different strength in one eye being stronger than the other. I see green you see brown. I see dots, you see blotches. The only proper thing to do when examining coins, is don't do it in the dark.
Dang! You Skipped right over my question. I thought you would be happy to see me again and would want to give me a nice warm CT welcome. I know you can't have me on ignore already cuz I just joined. I was hoping to get schooled on these "repaired chop marks"