4

My VW Polo 6R left tail light is off and it seems there are several kinds of bulbs available for purchase:

12V 5W
12V 12W
12V 5W + 12V 12W
12V 12W + 5V 5W
...

My first guess is that the 5V is just a mistake on the listing. But what are the bulbs that are listed as a combination of 5W and 12W for ? Do they draw different currents when the engine is on/off ?

  • 1
    Are you sure it is 12W and not 21W? – HandyHowie Oct 23 at 10:02
13

If it is a 21W/5W bulb, then it has 2 filaments of different brightness.

The 5W filament is for the side/tail light for night driving.

The 21W filament is for bright illumination when you press the brake pedal.

Image copied from ToolStation

Image copied from ToolStation

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.