Thomasin,
If my understanding is close enough you are asking about
: "how to paint a convincing light effect?"
No matter what the local colors are you will have to change them a bit according to the temperature of the light.
If the light temperature is warm you will add yellow / orange / red to the lit side and the respectable contrast colors in the shadow, furthermore you will add a lighter value in the light and a darker in the shadows.
If your picture is a Lemon on a green table in a warm light it will be like this: the lit side of the lemon is a cadmium medium and the shadow be blue green.
If the light is cold: the lit side of the lemon is a bluish lemon yellow
and the shadow olive green.
About reflected light you will have to practice it in black and white because the values must be right too.
To make a light effect convincing you must obey the laws. A light surface reflects more light into a shadow than a dark one and so on....
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