A ballast, also called a driver or transformer, is a component that ensures a lamp receives the correct amount of current.

It regulates and stabilises the power so that the lamp operates safely and properly.

Why is a ballast necessary?

Some lamps cannot be connected directly to mains voltage (220–240V). Without a ballast, they would:

• Receive too much current
• Overheat
• Fail quickly or burn out

The ballast prevents this by limiting and regulating the current.

When do you need a ballast?

• Fluorescent and TL lamps: always needed
• LED lighting: often integrated or external as a driver
• Halogen (low voltage): uses a transformer

What about LED lamps?

Many modern LED lamps operate directly on 220–240V and have a built-in driver. In that case, you do not need an external ballast.

For some LED solutions (such as LED panels or strips), a separate driver is used.

Summary

A ballast ensures that a lamp works safely and efficiently by supplying the correct current. Whether you need one depends on the type of lamp and the application.