Choosing the right automotive bulb can feel overwhelming—especially when you're faced with similar-sounding types like H11, H8, H9, and H16. These bulbs are often listed together and sometimes even marketed as “H9/H11” or “H8/H11,” which only adds to the confusion. In this article, we’ll break down the differences and similarities between H11, H8, H9, and H16 bulb sizes.

The key takeaway:

What makes these bulbs seem so interchangeable is their connector shape. H11, H8, H9, and H16 bulbs all share a similar right-angle plastic connector with dual metal prongs inside. This design allows them to fit into many of the same sockets across different makes and models.

However, their internal specs—like wattage, brightness, and heat tolerance—set them apart. This matters because the wrong bulb can reduce visibility, overload wiring, or simply fail to perform as expected.

If you're upgrading to LED, many brands simplify things by designing a single LED bulb that covers all four types. For example, SEALIGHT offers versatile options like H11/H9/H8 LED headlight bulbs and H11/H8/H16 LED fog light bulbs.

The Similarities Between H11 vs. H8 vs. H9 vs. H16 Bulbs

Connectors and Mounting

Each bulb in this group uses a similar L-shaped connector with built-in locking tabs and a rubber O-ring to ensure a snug, vibration-resistant fit. This makes them physically interchangeable in many vehicles, though you should always double-check electrical specs before swapping one for another.

Function and Voltage

All four bulbs are single-filament and run on 12 volts, making them compatible with most car and truck electrical systems. Whether you choose halogen, HID, or LED versions, the core electrical design remains consistent.

The Differences Between H11 vs. H8 vs. H9 vs. H16 Bulbs

While these bulbs may look alike, their performance profiles are quite different:

Wattage and Heat Output

H16 runs at the lowest wattage, which is about 19 watts, making it ideal for energy-efficient fog light applications. H8 consumes around 35 watts and is also commonly used in fog lights. H11 draws 55 watts, striking a balance between brightness and efficiency. H9, the most powerful of the group, runs at 65 watts and is often used in high-beam applications.

Brightness in Halogen Form

H16 produces about 500 lumens. H8 gives off around 800 lumens. H11 typically delivers 1,350 lumens. H9 reaches up to 2,100 lumens.

Please note that these figures apply to halogen bulbs. LED upgrades can increase brightness dramatically—anywhere from 14,000 to 28,000 lumens for a pair, depending on the model.

Lifespan

Average lifespan for halogen bulbs varies, and usage patterns matter. For example, high beams like the H9 may last longer than expected simply because they’re used less often.

Below are the estimated lifespans of each bulb size:
H16: ~150 hours
H9: ~240 hours
H11: ~270 hours
H8: ~320 hours

H11, H8, H9, and H16 LED bulbs typically last thousands of hours, making them a smart investment over time.

Application

H11 is a common choice for low beam headlights and sometimes fog lights. H9 is usually found in high beam applications due to its high output. H8 is designed for fog lights and lower-power lighting setups. H16 is also used for fog lights, particularly in newer vehicles with a focus on efficiency.

Can You Swap These Bulbs?

H11 and H8

These two bulbs are often interchangeable. They share the same base design, but H11 is slightly more powerful and better suited for headlight use, while H8 is ideal for fog lights.

H11 and H9

These are also physically compatible, but H9 runs hotter and produces more light. If you're replacing an H11 with an H9, make sure your vehicle's wiring and housing can handle the extra heat.

H11 and H16

H16 bulbs typically fit H11 sockets without issue, but they run at lower wattage and brightness. This makes them a great fog light option but not a suitable substitute for low or high beam headlights.

A Note on H16 Shapes

H16 comes in two forms: the L-shaped version (compatible with H11, H8, and H9) and the T-shaped version, which matches bulbs like 5202 or 2504. These two types are not interchangeable. Always check the shape before you buy.

How to Choose the Right Bulb

Step 1: Confirm Your Current Bulb

The easiest way to know what you need is to check the bulb you're replacing. Look for markings on the base—H11, H8, H9, or H16 should be printed clearly.

Step 2: Check the Manual

Your owner’s manual will list the correct bulb types for each lighting function—headlights, fog lights, daytime running lights, and more.

Step 3: Use a Vehicle Selector

Online tools like the one on SEALIGHT Canada Car Bulb Finder let you enter your make, model, and year to instantly see compatible bulbs.

Should You Upgrade to LED?

LED upgrades offer better brightness, longer lifespan, and lower energy consumption than traditional halogen bulbs. Most H11 LED kits on the market are designed to fit H8, H9, and H16 sockets as well, making the switch simple.

If you're upgrading fog lights, one LED set like SEALIGHT’s H11/H8/H16 LED fog bulbs can replace all compatible halogen types—no guesswork required.

Why Choose SEALIGHT?

SEALIGHT Canada makes it easy to upgrade with confidence. The vehicle selector tool ensures you get the perfect match, and their LED kits are engineered for cross-compatibility across H11, H8, H9, and H16 sockets. Enjoy fast shipping, hassle-free returns, and reliable performance that outshines ordinary bulbs.

Ready to light the way? Choose SEALIGHT LEDs and drive with clarity, safety, and style.