What are halogen headlights and how do they work?

We explain what halogen headlights are and how they work to keep you safe at night

Halogen headlights are named after a group of gas elements (the halogens) which are used inside them. In a bulb, the primary function of a halogen gas is extend the life of the tungsten filament – but more on that later.  

They aren’t just popular in the automotive world, however, as they have been used in homes and street lamps for over half a decade. That said, non-directional household halogen light bulbs are now banned in the EU due to their poor energy efficiency when compared to LED bulbs.

Best headlight bulbs

How do halogen lights work?

Halogens are one of the oldest types of bulbs you would expect to find on a new car sold in the UK. They work in a similar fashion to bulbs you would have seen in houses during the black and white times, meaning they consist of a glass bowl, filament and gas, and when current is passed through the filament it gives off light (and a large amount of heat).

They are called halogens as halogen gas is used to help prevent the tungsten filament being dumped on the glass and blackening the surface of the glass – meaning the bulb stays brighter for longer.

Halogen lights pros and cons

Pros

  • • Cheap
  • • Easy to replace in the event of failure

Cons

  • • Poor energy efficiency, impacting economy
  • • Life cycle not as long as LEDs are predicted to last

Enjoyed this tips and advice article? Then take a read of our piece investigating night time driving glasses.

Most Popular

Cupra Formentor vs Alfa Romeo Stelvio vs Porsche Macan
Cupra Formentor vs Alfa Romeo Stelvio vs Porsche Macan
Porsche Macan SUV

Cupra Formentor vs Alfa Romeo Stelvio vs Porsche Macan

Can the new Cupra Formentor stack up to the Alfa Romeo Stelvio and Porsche Macan in this sporty SUV battle?
17 Apr 2021
New 2021 Volkswagen Polo facelift launch set for 22 April
Volkswagen Polo
Volkswagen Polo Hatchback

New 2021 Volkswagen Polo facelift launch set for 22 April

Volkswagen will pull the wraps off its updated Polo supermini later this week
19 Apr 2021
New 2021 Mercedes EQB electric SUV revealed with 260-mile range
Mercedes EQB - front
Mercedes EQB

New 2021 Mercedes EQB electric SUV revealed with 260-mile range

The new Mercedes EQB joins the EQA and EQC in the German brand's all-electric SUV line-up
18 Apr 2021