Headlamp On-Off


There is sometimes a question when there is a collision at night, or at dawn or dusk, as to whether a vehicle had it's headlamps or tail lamps on at the time of the accident. A similar issue can arise during the day when a person alleges that a vehicle's brake lamps or turn signal lamps were not on.

When a lamp is energized during a collision and the impact causes a sufficient change in velocity (Delta-V), the filament in the bulb can show signs of stretching or uncoiling, This is caused because a hot filament is ductile and the filament is subject to inertia from the change in velocity. This phenomenon is called "hot shock." By contrast, a lamp that is not energized at impact may show signs of a sharp, fractured filament which is called "cold shock."

VMAR investigators carefully examine and photograph the lamps on a vehicle to look for evidence that the lamps were on or off at the time of the collision.  We can also analyze the related circuitry to determine if the headlamps, tail lamps, or turn signals would have been functioning properly at the time of the collision.

When You Need to Know . . .

  • Were the headlamps, tail lamps, brake lamps, or turn signals “on” or “off” at the time of the accident?
  • Were the headlamps, tail lamps, brake lamps, or turn signals functioning properly at the time of the accident?

Detail of Headlamp On-Off Investigation and Analysis Service

  • File review (including examination of police report and vehicle repair records)
  • Phone interviews of involved parties (when assigned)
  • Vehicle inspection, including examination and removal of lamps; documentation of lamp make, model, and location; and wiring circuit integrity test (when needed)
  • Thorough photo documentation of inspection and investigation process
  • Establish proper chain of custody and evidence storage (when needed)
  • Coordination and file documentation
  • Preparation of a fully detailed written report

Our 21 Day

In the world of claims adjusting we know that you usually have only a 30-day window in which to determine the merits of a claim. That's why we promise to handle your assignment and get the completed report into your hands within 21 calendar days.

And we back our promise with this guarantee:

If we do not get your assignment completed within 21 calendar days, then we cut your cost in half.