Halogen Headlights
Halogen headlights are the most commonly used headlights out there. Approximately 80% of vehicles on the road today have halogen headlights, though they are slowly being replaced by brighter and more efficient bulbs. Halogen headlight bulbs are constructed inside an enclosed bulb filled with halogen gases and a tungsten filament. Electricity is sent to the filament which then starts to heat up and glow. The halogen gas within the enclosed bulb will help exaggerate the light that the filament is producing. Halogen headlights typically use a reflector or projector housing.
Advantages
The advantages of using halogen headlights are they are the cheapest to manufacture and the cheapest to buy. They are easy to replace and provide a bright yellow-white light on the average up to 1,000 hours.
Disadvantages
The disadvantages of using halogen headlights are they typically have the shortest lifespan, and they produce the lowest number of lumens, averaging around 1,000 lumens.