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By "light spots" do you mean headlights?... I've never heard light spots used with reference to a motor vehicle before.
Four headlamps became an automotive trend in the late 50s and lasted into the 80s. Early on in the trend the only cars left with 2 headlights were economy cars, imports, and a few models where the designers had aesthetic reasons to want only 2 headlights... Also some cars could be ordered with the 2 lamp configuration by customers that disliked 4...
Apparently some designs that used 4 were not as good as the old 2 lamp configuration...IIRC a popular science article mentioned some consumer saying he rather have 2 good headlights than 4 mediocre ones.
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