I used two lamps for the light one with warm light and one torch with colder light. The one I like most is 3700K it can see the left and right parts of the apple separated by the two different lights and a soft background light. The first one is too cold, the warm light can almost not be seen , the one with 4700k is too warm and the cold light can’t be seen.
I took this apple exercise since the previous exercise was consisting in observation of the light falling on an apple during day. The artificial light makes the apple color more intense, the subject is more noticeable. The contour is more strongly defined. The difference is so stunning is like 2 different objects are those. The form, the texture, the color are all different.