HELLA

Maximising Bulb Life

Maximising Bulb Life
To maximise the operational life of an automotive bulb there are some important points to consider.

Rule of Thumb:

5% overvoltage halves the bulb life.

Headlamp bulbs are rated at 13.2 volts. Signal and marker bulbs are rated at 13.5 volts.

The light output of a tungsten filament light source is dependent on voltage.

Low voltage causes low output and lower operational life of halogen bulbs as regeneration does not occur.

Overvoltage causes excessive tungsten erosion and significantly shortens bulb life.


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