On a recent episode of the Carmudgeon Show podcast, auto journalist
    Jason Cammisa described a phenomenon occurring with some LED headlights
    in which there are observable minor spots of dimness among an otherwise
    bright field of light. “With complex arrays of LEDs and of optics,” he
    said, “car companies realized they can engineer in a dark spot where
    it’s being measured, but the rest of the field is vastly over-illuminated.
    And I’ve had now two car companies’ engineers, when I played stupid and
 said, ‘What’s the dark spot?’ … And the lighting engineers are all fucking
    proud of themselves: ‘That’s where they measure the fucking thing!’
    And I’m like, ‘You assholes, you’re the reason that every fucking new
    car is blinding the shit out of everyone.’” 

Amazing