When choosing a group 1 headlight bulb, the discussion of H1 vs H11 will come up. They have many similarities, but their differences mean they are not interchangeable.
Here we compared the H1 and H11 to help you decide on the bulb you can use.
Group 1 bulbs
The ECE came up with international standards and classifications for auto parts that include headlight bulbs to make it easier on car owners.
There are three groups of bulbs, and we are looking at H1 and H11 in group 1. Group 1 includes headlight and foglight bulbs with different sockets and power ratings. The H1 and H11 are both single filament bulbs.
H1 vs H11: Pros and cons
- Produces a high beam light
- Illuminates in front of the vehicle for a long-distance
- 1410 lumens of illumination
- Can be used as foglight or headlamp
- Can be blinding to oncoming traffic
- Are not blinding to oncoming traffic
- Perfect for every night driving due to low beam
- Manufactured to be used as foglights
- The LED option offers low heat dissipation
- Poor visibility in extremely dark situations
H1 vs H11: How Do They Differ?
Take a quick look at key differences and similarities
|Voltage||6 or 12||12|
|Wattage||55 watt||55 watt|
|Lifespan||2-3 years||5 to 7 years|
|Type of beam||High beam||Low beam|
|Socket||P 14.5 base with a single insert made of flat metal that plugs into a car lamp socket||Closed connector plug|
|Bulb equibalance||H1ST/VX||H8, H9, and L-shaped H16|
|Equivalent bulb type||HID, Halogen, and LED||HID, Halogen, and LED|
|Uses||Foglight and headlight||Foglight|
|Traffic blinding||Can be blinding to oncoming traffic||Not blinding to oncoming traffic|
1. Volts and wattage
Standard headlight bulbs offer 55 watts when used as a low beam. They work on 12 volts of power and draw about 4.58 amps. When purchased in LED, Halogen, and HID, they can give more than 55 watts of illumination.
The H1 offers 6 or 12 volts and 55 watts.
The H11 also provides 12 volts and 55 watts.
Lumens are how bright of a light the bulb emits. The lumens can change depending on the type of light you choose.
The H1 provides 1410 lumens, more than the H11.
The H11 offers 1200 lumens, 210 less than the H1.
A bulb’s life span depends on road conditions (bumps, potholes, etc.), how you use the bulb, like using it for something other than driving, such as illuminating an area, or how long you use the lights– a 6-hour drive in the dark vs. a 45-minute ride in the dark.
The standard H1 bulb lifespan is between 2-3 years.
The standard H11 bulb has a lifespan of 5-7 years as it offers a dimmer light.
4. Type of beam
Headlights are categorized by high beam and low beam. In high beams, there is no angle change. The light is very bright and shines straight ahead of the vehicle at a long distance.
Low beams are what you use for night driving. They are less intense than a high beam but illuminate the road well. Some refer to them as “dipped beams” as the light angles toward the street.
The H1 is a high beam light that is glare-free but intense. When lit, they are bright white to selective yellows.
The H11 is a low beam headlight offering a shorter distance of illumination.
Bulb sockets hold the bulb in place and are the electrical source for the bulb. In Class 1 auto bulbs, the socket and its wiring are different on each bulb.
The H1 has a P 14.5 base with a single insert made of flat metal—the H1 plugs into a car lamp socket.
The H11 has a connector plug that is closed. Its wiring is at the broadest part of the bottom ring. The connecting end of the light assembly goes into an H11 connecting plug.
6. Bulb equivalents
Equivalent bulbs are interchangeable and offer the same illumination.
H1 is equivalent to H1ST/VX in Halogen, HID, and LED.
The H8, H9, and L-shaped H16 are equivalent to the H11 in HID, Halogen, and LED.
H1 is used as foglights and headlamps in most smaller cars (sedans and coupes). Their most common use is emergency vehicles because of their brightness. Their intense illumination offers safety in the dark of night.
Most vehicles use H11 bulbs as foglights due to their nonbeam function.
Advantages and Disadvantages of LED, HID, and Halogen bulbs
- Extended design choices
- 80% more efficient than HID and Halogen bulbs when used correctly
- The most extended lifespan of the three technology options
- Need very little space
- Offer a 0.001-second switch-on period creating a shorter braking distance
- An increased level of reliability
- Extremely energy efficient
- Limited range of some bulbs due to light illumination
- Not blinding to oncoming traffic
- The most commonly used bulb technology
- The most affordable bulbs
- Made for use in both old and newer model cars
- Yellow, warm light
- Heat created by Halogen lights uses more energy
- Less expensive than a Halogen bulb
- Much brighter than a Halogen bulb
- More powerful in the dark than an LED bulb
- Offer seven different colors of light, giving various bulb temperature options
- More affordable than HID and LED bulbs
- Require more maintenance than Halogen and LED bulbs
Does the Color of the Headlamp Bulb Matter?
Yes. The color temperature of bulbs is measured in Kelvin. The temperature of the bulb is directly related to the light’s source. This is true of HID and LED bulbs.
When steel is heated, it goes from red to orange, then yellow, and is white at its hottest.
A match’s flame is about 1700 K. A standard incandescent bulb is around 2400 K, while the sun beating down on you can reach 5000 K. Bulbs that emit yellow light are 3500 K, while a white bulb is 6000 K.
Blue bulbs which are at the highest end of the spectrum give off 9000 K. So, the color of the bulb’s light does make a difference in the longevity of the bulb, primarily if used in a light assembly that holds heat.