Seeing is believing
I respectfully disagree with the contention that lights in the sun have a cool appearance. From my observation of things in the sun, there is a warm quality in the lights. The cooler aspects occur in the top planes in shadow areas which are illuminated by the color of the sky. Shadows which have lower levels of illumination than lights are more easily influenced by the colors of surrounding areas. Under planes in sunlight are generally influenced by the color of the ground, especially the underplays closest to the ground. There is a fantastic painting by Gerome "Arabs Crossing the Desert" (which I am attaching a detail) that beautifully demonstrates painting in sunlight. I've had the pleasure of seeing the original and the top of the hindquarters of the grey horse is blue-purple reflecting the sky while the belly of the white horse is yellow reflecting the desert.
In respect to indoor light the color of the light would be dependent on the light source color. Incandescent light is very warm and natural north window light is much cooler. Shadow color is dependent on background colors reflecting into it, thus the old master technique of incorporating background colors into flesh shadows.
The key is to be armed with knowledge and study the situation first hand. Don
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