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Auxillary Lamp Beams

Eurobeam or Driving beams
Used with your high beams. The pattern is conical, flattened at the top and bottom and about 20 degrees wide. Useful at 2000-2500 feet. Rallyists typically use four Driving lamps, two aimed straight ahead and two more splayed out to make a wider lighted area. DOT requires that driving lights be wired so that they can only come on with your high beams and go off with your low beams


Pencil Beam
A very long, narrow beam - very specialized. They will light a reflector at two miles, but are not very useful unless you have a lot of them. They used to be used for Rally in conjunction with other lamps, but with the advent of Free Form lamps and the subsequent improvement in Driving beams, have fallen out of favor. Desert racers and Off-shore boat racers still use them, but with six or more on a vehicle. DOT requires that Pencil Beams be wired so that they can only come on with your high beams and go off with your low beams

Fog Pattern
Very wide, maybe 100 degrees wide with a sharp cutoff. It's only good for a couple hundred feet by design. It's purpose is to light up the road in bad weather with the light that reflects off of the fog/rain/snow/dust directed into the grill and not back into the driver's eyes.
 
Amber Fog lamps produce a longer wave length light which causes less eye strain and make you more visable in bad weather. Cadmium is used to achieve the color, but it is a heavy metal and has an environmental impact causing it's use to be outlawed in most modern countries. This is why amber fog lamps are nearly impossible to find anymore. A simular effect can be achieve by using an all-weather dichroic bulb, or a yellow film on the lens.
 
A clear fog lamp is often used to supplement the low beams. If a vehicle has poor composite headlamps, installing higher performance bulb may only result in more stray lights. The addition of clear Fog lamps my be the most cost effective improvement.

Cornering Pattern
A flood light - good for only several hundred feet - also very specialized. Used in Rally in conjunction with other lamps. Good for offroad use if all your offroad is rock crawling or slow travel. DOT requires that Cornering lights be wired so that they can only come on with your high beams and go off with your low beams