5202, H16, and 2504 are names that frequently appear when shopping for fog-light bulbs, and the overlap between aftermarket cross-references makes the group confusing. The biggest source of confusion is that H16 can refer to more than one physical bulb style.

Before buying a replacement, identify the actual base on the original bulb. A familiar name alone is not enough to guarantee fitment.

5202 vs h16 vs 2504

The Most Important Point About H16

The older L-shaped H16 belongs to the H8/H9/H11-style family and should not be treated as the same bulb as 5202 or 2504. A newer T-shaped H16 designation can appear in cross-reference lists alongside 5202, 2504, PSX24W, 5201, or 9009, depending on the manufacturer and vehicle.

If the original bulb has an L-shaped H11-family base, start with the H11/H8/H9 collection. If it has a 5202-style fog-light base, use the dedicated 5202 or 2504 family.

what is h16 bulb

What Is a 5202 Bulb?

5202 is a fog-light bulb size used on a range of North American vehicles. It is commonly cross-referenced with names such as 5201 or 9009 in aftermarket catalogues, though fitment should always be confirmed by the product listing.

Browse the 5202 LED fog light bulb collection for confirmed 5202 applications.

What Is a 2504 / PSX24W Bulb?

2504 is commonly associated with the PSX24W family. It is another compact fog-light bulb used in specific housings and can be grouped with related T-shaped cross-references in aftermarket LED catalogues.

For confirmed applications, use the 2504 / PSX24W LED fog light collection.

5202 vs 2504: Are They the Same?

They are closely related in the aftermarket and may appear together on multi-fit LED products, but do not assume universal interchangeability. Tab shape, connector details, and housing depth can differ by vehicle and product.

If an LED product explicitly lists both 5202 and 2504/PSX24W as supported cross-references, follow that product's fitment information. Otherwise, match the original bulb number.

5202 vs 2504 bulb difference

Where Does H16 Fit Into This?

H16 needs extra attention because the name is used inconsistently across regions and catalogues. The L-shaped H16 used in the H11 family is physically different from the T-shaped bulbs sometimes cross-referenced with 5202/2504.

When in doubt, compare the original bulb's connector and locking tabs with the product images and fitment list rather than relying only on the H16 label.

What Makes a Good LED Fog Light Replacement?

Correct Beam Position

Fog lights work best with a low, wide pattern. The LED emitters should sit at the intended focal point so the housing can spread light across the foreground without throwing excessive glare upward.

Weather Resistance

Fog lamps sit low on the vehicle and are exposed to rain, road spray, snow, slush, and salt. A secure seal and weather-resistant bulb construction are especially important in winter climates.

Colour and Usable Contrast

White LED fog lights are common, while yellow options may be preferred by drivers looking for a warmer appearance in poor weather. Beam shape and usable road contrast matter more than colour alone.

Installation Checklist

  1. Remove the original bulb and read the exact bulb number.
  2. Compare the base and connector with the replacement product.
  3. Confirm any cross-reference is explicitly listed by the LED manufacturer.
  4. Install the bulb fully and keep the housing seal clean.
  5. Test the beam on a wall or flat road surface before driving.

Frequently Asked Questions

Is 5202 the same as H16?

Not universally. An L-shaped H16 is part of the H11-style family and is different from 5202. Some T-shaped H16 references overlap with 5202-family aftermarket listings.

Is 2504 the same as PSX24W?

2504 is commonly cross-referenced with PSX24W. Confirm the exact vehicle and product fitment before purchase.

Can a 5202 LED fit a 2504 socket?

Some multi-fit LED products support both, but the product must explicitly list the relevant cross-reference. Do not force a bulb that does not lock correctly.

Where can I compare other fog-light sizes?

The SEALIGHT fog light bulb category groups additional fog-light sizes and applications.

Final Verdict

5202, H16, and 2504 belong to an overlapping but confusing fog-light naming ecosystem. The safest method is to identify the original base and bulb number, then use an LED product that explicitly lists that fitment. Pay special attention to the difference between L-shaped and T-shaped H16 bulbs.