Remember that dark colors absorb light, while light colors reflects light... with light colored cars, your aim may be more on the reflectivity aspect of the paint instead of depth. it is indeed possible to make a white paint look "deep" but it all depends on the paint shade itself.

white is very simple to clean, deep cleanse it with a cleaner, clay it, polish it flat then use a sealant or other high quality wax to obtain the best reflections... having little orange peel on the paint would help a lot as well.