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Here’s a video on how the IS300 headlights are adjusted. I don’t have firsthand experience with this brand of lights, but I would not think they would have any internal adjustment.

Do you have to take the auto-level motors from the stock lights and swap over to the Spec D?

The “hyper flashing” is probably due to the new lights using led, and the old lights were incandescent. Usually a ballast resistor is needed to calm the fast flash.
 
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