Sometimes spot metering can tell you the hottest points within a proposed image. Even though you may be willing to let a street lamp burn out its small area, you may not be willing to let the nearby sidewalk burnout, or it may not be that important. Depends on the image you were looking for.
I don't do this very well myself, but i think it may be useful to try a manual white balance setting or a custom setting that best reflects a scene. Going home and trying to set a white balance after the fact can be difficult to recall how things looked in real life.
Sounds like fun - enjoy
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