What’s The Difference Between H11 And H11b?

H11 and H11b are two kinds of halogen bulbs used for car lights. They are alike, but there are significant differences. This guide will tell you the important differences so you can pick the right one for your vehicle.

H11 and H11B

We’ll go over

  • size,
  • beam pattern,
  • wattage, and
  • brightness levels

to help you tell them apart. Knowing the distinctions will help you decide which bulb you need for its performance and how long it will last.

Difference between H11 and H11b

H11 and H11b are halogen headlight bulbs. Both provide excellent light for night driving. They have the same level of brightness yet are built differently. H11 is a single-piece design, whereas H11b is a two-piece.

Let’s take a closer look at the contrast between these bulbs:

Definition of H11 and H11b

H11 and H11b are two different headlights used in vehicles. Cars and trucks typically have these headlights, but some differences exist.

H11 is an OEM part. It replaces the original factory headlight assembly in most mid-sized vehicles. It works the same as the original but is cheaper than a dealer. It aims low for nighttime driving and doesn’t provide as much light as newer options.

H11b is an aftermarket part. It replaces the factory headlight assembly in some types of cars and trucks. It has a higher output than H11 due to improved technology. It produces brighter light and lasts longer. It’s popular with car enthusiasts and safety-conscious drivers.

Uses of H11 and H11b

H11 and H11b are two different types of automotive headlamp bulbs. The difference is in the filament. H11 is a single-filament type, while H11b is a dual-filament.

  • Single-filament creates less intense light, so it’s usually used as low-beam headlights.
  • Dual filament, like H11b, produces a brighter light. That should be used only for safety reasons or for night driving.

The base design is different too. H11 uses HB3 with three contacts. H11b uses HB4 with four connections.

So, when selecting automotive headlamps, consider single or multiple filaments, low or high-intensity outputs, and HB3 or HB4 basis design.

Advantages and Disadvantages of H11 and H11b

When deciding between H11 and H11b, it is essential to know the pros and cons of each.

H11 Advantages:

  • It can bear high wattages in a wide range of temperatures.
  • Cheaper than H12, which offers similar performance.
  • Great for street lamps, headlights, and fog lamps where temperatures are high.

H11b Advantages:

  • Brighter light with a whiter color.
  • Modern look compared to regular halogen bulbs.
  • Up to 40% more efficient than H11.


  • Limited availability in many countries.
  • A short lifespan (about one year).
  • More expensive than conventional halogen bulbs.
  • We may need an extra fan for heat reduction in older fixtures.


H11 is typically used as a headlight bulb. H11b is an upgraded version of H11, offering more illumination. Both bulbs provide advantages like longer life and energy efficiency. But H11b’s main benefit is its higher luminosity.

It can be tough to pick the right bulb for your vehicle. Knowing the difference between H11 and H11b could make it easier. So, make sure to consider your vehicle’s specs and lighting requirements when picking the best option:

  • H11
  • H11b

Frequently Asked Questions

What is the difference between H11 and H11B headlight bulbs?

H11 bulbs are single-beam bulbs that emit light in one direction, while H11B bulbs are dual-beam bulbs that emit two light rays in two directions.

What are the advantages of H11B bulbs over H11 bulbs?

H11B bulbs offer improved visibility and more powerful illumination compared to H11 bulbs.

Are H11 and H11B bulbs interchangeable?

Yes, H11 and H11B bulbs are interchangeable as long as the bulbs are the same wattage and shape.