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Understanding White Balance
Each light source type produces light that has a different and distinct color temperature. Our eyes and brain worlk together to make adjustments that tend to average out the differing light source color temperatures that we see.
The cameera can't do that, so photographers strive to only have one light source color temperature in a scene, so they can set an accurate white balance for that particular light source color temperature.
For instance, tungsten and most other incandescent lights have a yellowish color temperature, Flourescent lights have a greenish color temperature.
When 'tungsten' is chosen in the White Balance menu the camer is being told in advance what light source color temperature is being used in the scene.
If there is both tungsten and flourescent lighting in a scene we can set the camera white balance to fully correct for only one or the other light source. However, we can adjust the white balance to partially correct each color but then we have an oddball color cast in out photo.
When there are many light source color temperatures on a night shot we can only set the white balance to some partial solutionm.