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Fog: short range (low beam) wide angle horizontal, sharp cut vertical.....
Used for low visibility conditions, rain/fog/dust/snow
Driving: long range (hi beam) narrow angle horizontal narrow angle
vertical...... Used to augment hi beam stock lighting
Pencil Beam: very long range (hi beam) extreme narrow horizontal extreme
narrow vertical usually used in conjunction with Driving lites, considered a
very "hot" highly reflective beam pattern with a very small "pencil of lite"
at long range
Euro H1/H4: Considered the same as a fog at low beam and a driving at hi
beam.... Sharp vertical cutoff at low beam with wide horizontal angle