Japanese vehicles are widely used in markets around the world, including North America, Latin America, Southeast Asia, Australia, and the Middle East. Brands such as Toyota, Honda, Nissan, Subaru, Mazda, Mitsubishi, Suzuki, and Lexus have created a large aftermarket demand for replacement and LED upgrade bulbs.

However, Japanese cars do not use one standardized bulb type. Depending on the vehicle model, production year, trim level, lighting position, and whether the original lamp is halogen, HID, or LED, the bulb specification can be different.

For automotive lighting distributors and aftermarket buyers, understanding the common bulb types is therefore important.

Among the most frequently encountered types are T10, T15, T16, T20, H11, H16, 9005/HB3, 9006/HB4, HIR2, and various festoon bulbs such as T10×31.

This article provides a practical overview of the common bulb types found in Japanese vehicles and explains where they are typically used.

1. T10 — One of the Most Common Small Automotive Bulbs

If you are researching Japanese car LED bulbs, T10 is one of the first bulb types you should know.

T10 is a small wedge-base bulb. KOITO's automotive bulb information lists the conventional T10 as a 12V 5W bulb and identifies applications including clearance lamps, side turn-signal lamps, and interior lamps. (小糸製作所)

Typical applications include:

• Position lights

• Parking lights

• Clearance lights

• License plate lights

• Side marker/turn-signal applications

• Interior lights

• Map lights

• Dashboard-related applications

A Japanese vehicle may use T10 bulbs in several different locations.

For example, Nissei POLARG's fitment information for the Honda Stepwgn lists T10 for the position light and license plate light, while some interior locations use T10×31. (日星工業株式会社)

Why is T10 so popular?

One reason is its simple wedge design and compact size.

For the aftermarket, T10 is also attractive because LED replacement products are available in many configurations:

• 5W-equivalent LED

• 12V LED

• Canbus-compatible versions

• White

• Amber

• Red

• Different LED quantities

• Different housing designs

This makes T10 LED bulbs an important category for Japanese-car aftermarket lighting.

2. T15 — A Small Bulb with Different Applications

T15 is another wedge-style automotive bulb that buyers may encounter when working with Japanese vehicles.

It is physically larger than T10 and can be used in applications where more output is required.

Typical applications can include:

• Reverse lights

• Backup lights

• Some daytime-running-light applications

• Other auxiliary lighting positions

However, it is important not to assume that every Japanese vehicle uses T15.

The exact bulb depends on the vehicle.

This is particularly important for LED replacement sales because T15 and T16 can appear similar but are not automatically interchangeable in every application.

For a product catalog, it is therefore better to list the exact bulb size and fitment rather than simply saying:

“Fits Japanese cars.”

3. T16 — Very Common for Reverse Lights

T16 is another important wedge-type bulb.

KOITO lists T16 applications including high-mounted stop lamps and backup lamps, with a 12V specification used in automotive applications. (小糸製作所)

Nissei POLARG's Japanese vehicle fitment database provides a good practical example. On certain Honda Stepwgn applications, the reverse light is listed as T16, while on certain Subaru Levorg applications the backup light is listed as T20. (日星工業株式会社)

This demonstrates an important point:

The same lighting function does not always use the same bulb size across Japanese vehicles.

For example:

Therefore, buyers should always check the specific vehicle application.

4. T20 — An Important Bulb for Turn Signals and Tail Lights

T20 is another major Japanese automotive bulb category.

KOITO lists several T20 configurations, including:

• 12V 21/5W double-filament

• 12V 21W single-filament

• Amber 12V 21W versions

Applications include:

• Stop/tail lights

• Turn signals

• Backup lights

• Cornering lights

• Clearance lights (小糸製作所)

The important thing about T20 is that not every T20 bulb has the same base configuration.

For example:

T20 21/5W

Typically a dual-filament configuration.

It can provide two lighting functions from one bulb, such as:

Tail + Brake

T20 21W

Single-filament configuration.

It can be used for:

Turn signal
Reverse light
Other single-function applications

Amber T20

Amber versions are commonly used for turn signals.

KOITO specifically notes that the amber T20 has a different base configuration and should not simply be treated as interchangeable with every standard T20. (小糸製作所)

This distinction is very important when selling LED replacement bulbs.

5. T20 Pinch-Type Variants

Another term that Japanese-car bulb buyers may encounter is:

T20 Pinch / T20 Pinch-Tab / T20 special base

This is one reason that simply writing “T20” in a product listing may not be enough.

For example, Nissei POLARG's fitment information for the Honda Stepwgn specifies:

T20 with a different pinch configuration

for certain front and rear turn-signal applications. (日星工業株式会社)

A Subaru Levorg application also lists a T20 pinch-type configuration for turn signals. (日星工業株式会社)

For aftermarket LED suppliers, this means the product database should ideally include:

Bulb Type + Base Configuration + Voltage + Application + Vehicle Fitment

rather than just the word “T20.”

6. H11 — A Common Headlight and Fog-Light Bulb

Moving from small wedge bulbs to headlight bulbs, H11 is an important type.

H11 is a halogen bulb commonly associated with:

• Low beam

• Fog lights

• Auxiliary lighting

KOITO's Japanese automotive bulb information lists H11-type applications, while Nissei POLARG vehicle fitment data shows H11 used for low beams and fog lights on certain Japanese vehicles. (小糸製作所)

For example, one Honda Stepwgn application lists:

• Low beam: H11 or HID

• Fog lamp: H11

This shows why Japanese vehicle bulb catalogs can become complicated: the same model name can have different bulb configurations depending on the trim or equipment package.

7. H16 — Commonly Seen in Fog-Light Applications

H16 is another bulb worth knowing when researching Japanese vehicles.

KOITO lists:

H16 — 12V 19W

and identifies it as a fog-lamp-specific application. (小糸製作所)

For example, Nissei POLARG lists H16 for the fog lamps of certain Subaru Levorg applications. (日星工業株式会社)

H16 is therefore particularly relevant for:

• Japanese passenger cars

• Fog-light replacements

• LED fog-light upgrades

• Automotive lighting aftermarket products

8. 9005 / HB3 — High Beam Applications

Another important bulb type is:

9005 / HB3

KOITO lists 9005/HB3 as a 12V 60W halogen bulb and identifies it for four-lamp headlight systems, particularly high-beam applications. (小糸製作所)

Nissei POLARG's fitment information for both Honda Stepwgn and Subaru Levorg provides examples of 9005/HB3 being used for high beams. (日星工業株式会社)

For international aftermarket catalogs, it is useful to display both names:

9005 / HB3

because different markets and buyers may search using either term.

9. 9006 / HB4 — Another Important Headlight Bulb

The related bulb type is:

9006 / HB4

KOITO lists 9006/HB4 as a 12V 55W halogen bulb and identifies it with four-lamp headlight systems, particularly low-beam applications. (小糸製作所)

The important distinction is:

However, fitment must always be checked by vehicle because lighting configurations vary between models and production years.

10. HIR2 / 9012 — Newer-Generation Headlight Applications

Another bulb type that deserves attention is:

HIR2 / 9012

KOITO lists HIR2 as a 12V 55W bulb for four-lamp headlight applications. (小糸製作所)

HIR2 is especially relevant when researching newer Japanese vehicles compared with older traditional halogen systems.

For aftermarket suppliers, it is useful to include both:

HIR2 / 9012

in product titles and search keywords because customers may know either designation.

11. T10×31 — The Common Festoon-Style Interior Bulb

Not all Japanese automotive bulbs are wedge bulbs.

A common interior-light format is:

T10×31

This is a cylindrical/festoon-style bulb rather than the standard T10 wedge.

KOITO lists T10×31 applications including:

• Room lights

• Map lights

• Interior lights (小糸製作所)

For example, certain Honda Stepwgn applications use T10×31 for front, middle, rear, and trunk interior lighting. (日星工業株式会社)

Therefore, when a customer asks for a “T10 bulb,” it is important to clarify whether they mean:

T10 wedge

or:

T10×31 festoon

They are completely different physical designs.

12. T5 — Small Dashboard and Instrument Bulbs

T5 is much smaller than T10.

KOITO lists T5 applications such as instrument-related lighting, with 12V versions including 1.2W and 2W. (小糸製作所)

Potential applications include:

• Instrument panels

• Dashboard illumination

• Switch illumination

• Small indicator lighting

T5 is therefore more relevant to interior and instrument lighting than exterior truck or headlight applications.

13. G18 and Other Metal-Base Bulbs

There are also traditional metal-base bulbs used in automotive applications.

For example, KOITO lists G18 bulbs with BA15s bases for applications including:

• Clearance lamps

• Side turn signals (小糸製作所)

These types are less commonly discussed in modern LED aftermarket marketing than T10, T16, T20, H11 or 9005, but they remain relevant when dealing with older vehicles and replacement applications.

14. A Practical Japanese Car Bulb Reference Table

For an automotive lighting website or product catalog, the following table provides a useful starting point:

Exact bulb specifications and applications vary by vehicle, year, trim, and market. The table is a general reference rather than a universal fitment chart.

15. Why Japanese-Car Bulb Fitment Is More Complicated Than It Looks

A common mistake among new aftermarket buyers is to think:

“Toyota uses T10.”

or:

“Honda uses T20.”

This is too broad.

A single vehicle model can have different bulb configurations depending on:

• Model year

• Generation

• Trim

• Market

• Headlight system

• Factory LED equipment

• HID equipment

• Optional fog lights

• Rear lamp design

For example, Nissei POLARG's fitment data for the Honda Stepwgn shows H11/HID for low beam, 9005/HB3 for high beam, H11 for fog lights, T10 for position and license lights, T20 for turn signals, and T16 for reverse lights on a particular generation. (日星工業株式会社)

That single example demonstrates how many different bulb types can exist on one vehicle.

16. Japanese Cars Are an Important Market for LED Replacement Bulbs

The reason this matters to the aftermarket is simple.

Many Japanese vehicles have relatively accessible bulb-replacement applications, especially in areas such as:

• Position lights

• Reverse lights

• Turn signals

• License plate lights

• Interior lights

• Fog lights

This creates opportunities for LED replacement products.

Popular search terms can therefore include:

T10 LED Bulb

T15 LED Bulb

T16 LED Reverse Light

T20 LED Turn Signal

T20 LED Brake Light

T20 Amber LED

H11 LED Headlight

H11 LED Fog Light

H16 LED Fog Light

9005 HB3 LED

9006 HB4 LED

HIR2 9012 LED

T10×31 LED Interior Bulb

These keywords can also be combined with vehicle brands and applications, such as:

Toyota T10 LED
Honda T20 LED
Subaru H11 LED
Toyota 9005 LED
Japanese car reverse light bulb
Japanese car LED replacement bulbs

17. T10, T15 and T20 Are Especially Important for Aftermarket Sellers

If an importer is building a Japanese-car LED bulb product range, a practical starting point would be:

Small wedge bulbs

T5 → T10 → T15 → T16

Larger wedge bulbs

T20

Headlight / fog-light bulbs

H11 → H16 → 9005/HB3 → 9006/HB4 → HIR2/9012

Interior bulbs

T10×31 and other festoon sizes

This creates a much more complete product range than focusing only on headlight bulbs.

18. The Key Point for Automotive Lighting Buyers

Japanese vehicles do not have one universal bulb system.

Instead, they use a combination of Japanese-market bulb specifications, internationally recognized bulb numbers, wedge bulbs, festoon bulbs, and halogen headlight standards.

For aftermarket buyers, some of the most important types to understand are:

T10 — position, license and small lighting

T15/T16 — reverse and auxiliary applications

T20 — turn signal, brake/tail and reverse applications

T10×31 — interior lighting

H11/H16 — fog and headlight applications

9005/HB3 — high beam

9006/HB4 — low beam

HIR2/9012 — headlight applications

The most important lesson is that the bulb number alone is not enough. A reliable automotive bulb catalog should connect the bulb type with the vehicle model, year, lighting position, base configuration, voltage, and original lighting technology.

For an automotive lighting manufacturer or exporter, this makes accurate fitment data just as important as the LED product itself.

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