GDL Bulbs (2005-2007): Design: Ballast

An electronic ballast is connected to each headlight. The ballast serves as a voltage regulator and generates alternating current (AC).

Primary tasks: 

1. Light the bulb.
2. Regulate light during operation.

A initial voltage of about 24,000 V for a very brief period (less than 1 ms) is required to light the bulb.

The ballast transforms the vehicle's 12 V (DC) to 1000 V (AC).

The high voltage contact amplifies the voltage an addition 25 times.

Once the bulb has been lit, voltage is regulated down to about 100 V, which is required to keep the bulb lit.

Power consumption: 10 W.