In short, it depends on your model year and whether you have halogen or HID headlights. If halogen, the low beam is typically H11 and the high beam 9005; if HID, you’ll need the ballast-specific xenon bulb (commonly D2S or D3S) rather than a halogen bulb. Always verify by checking the owner's manual or the bulb you remove from the assembly.
The Lexus IS250, produced from 2006 through 2013, was offered with two primary headlight configurations that affect which bulb you must purchase. The exact bulb type is not interchangeable across systems, and the same car can differ by market or trim. This guide explains how to identify your setup and source the correct bulb.
Halogen headlight setup: typical bulb types for IS250
If your IS250 uses standard halogen reflectors/projectors, the bulbs you’ll replace are halogen. Common sizes across model years are:
- Low beam: H11 (about 55W)
- High beam: 9005 (HB3)
- Fog lights: H11 (where equipped)
Note: Some early or market-specific IS250s used different low-beam sizes. Always double-check by inspecting the bulb you remove or consulting the owner’s manual for your exact VIN/trim.
HID/Xenon headlight setup: how to confirm the right bulb
If your IS250 is equipped with factory HID headlights, you will not use a halogen bulb. Bulbs for HID systems must match the ballast model (for example D2S or D3S) and are not interchangeable with halogen bulbs. The exact bulb type depends on the year and the specific HID kit installed.
How to confirm the correct HID bulb type:
- Check the owner’s manual under the lighting section for the HID bulb code (if shown).
- Look at the back or base of the existing HID bulb or ballast label for a bulb code (D2S, D3S, etc.).
- If you’re unsure, contact a Lexus dealer or an auto parts retailer with your VIN to confirm the correct bulb family.
When in doubt, avoid substituting a halogen bulb into HID housing, and vice versa, to prevent ballast or electrical problems.
Practical steps for buying and replacing bulbs
Once you know your system type, follow these steps to buy and replace safely:
- Identify your system: halogen or HID by looking at the headlight housing or manual.
- Record the bulb code from the existing bulb or manual (for halogen: H11, 9005; for HID: D2S/D3S, etc.).
- Purchase bulbs that match your system and year; consider OEM or high-quality aftermarket brands with good fitment reviews.
- Follow proper safety precautions: disconnect the battery, allow the headlights to cool, and avoid touching the bulb glass with bare hands if using halogen bulbs.
Professional installation can help ensure correct alignment and avoid ballast issues, especially for HID setups.
Summary
The Lexus IS250 can use either halogen or HID headlights, and the bulb types are not interchangeable. For halogen versions, expect low-beam H11 and high-beam 9005; for HID versions, use the ballast-specific bulb (commonly D2S or D3S) after confirming with the manual or dealer. Always verify with your VIN, the bulb itself, or a trusted retailer to ensure you buy the exact matching bulb for your car.