What Size Bulbs Does a 1999 Jaguar XJ8 Use?
Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.
Installation Difficulty
Easy (Plug and Play)
Est. Replacement Cost
$15 - $40 (Halogen) / $30+ (LED)
What Lighting System Does the 1999 Jaguar XJ8 Have?
The 1999 Jaguar XJ8 features an extensive lighting system with 12 bulb positions. It uses halogen technology with a single H7 LED dual-filament bulb handling both low and high beams. The XJ8 has been available from 1998 to 2009, and the 1999 model falls in the early-generation years.
Can You Put LED Bulbs in a 1999 Jaguar XJ8?
Upgrading the 1999 Jaguar XJ8 to LED headlights is straightforward since it uses a single H7 LED dual-filament bulb for both low and high beams. You only need one pair of LED bulbs to upgrade both functions. Look for a H7 LED LED kit that specifically supports dual-filament operation to ensure both beams work correctly. For the fog lights, a 9006 LED LED bulb provides a clean white output that pairs well with LED headlights.
How to Replace Bulbs on a 1999 Jaguar XJ8
The H7 bulb uses a spring clip or wire retainer that holds the bulb in the socket. To remove the old bulb, disconnect the wiring harness first, then twist the bulb counter-clockwise and pull it out. Older model years like the 1999 XJ8 typically offer easy access to the headlight bulbs from behind the headlight assembly under the hood. Most owners can complete the swap in under 10 minutes per side. When installing the new bulb, avoid touching the glass with bare fingers. Skin oils create hot spots that shorten bulb life. Wear clean gloves or handle the bulb by its plastic base only. The fog lights are accessed from underneath the front bumper. You may need to remove a few plastic clips or screws from the fender liner to reach the 9006 LED fog light socket.
Full Upgrade Bundle
Upgrade All 12 Positions at Once
1999 Jaguar XJ8 Complete Bulb Size Chart
| Position | Bulb Size | Shop |
|---|---|---|
Low Beam | H7 LED | Buy H7 LED |
High Beam | H7 LED | Buy H7 LED |
Fog Light | 9006 LED | Buy 9006 LED |
Brake Light | 2825 LED | Buy 2825 LED |
Side Marker | 2825 LED | Buy 2825 LED |
Turn Signal Front | 7506 LED | Buy 7506 LED |
Turn Signal Rear | 12496 LED | Buy 12496 LED |
Reverse Light | 7506 | Buy 7506 |
License Plate | 6418 | Buy 6418 |
Map Light | 2825 | Buy 2825 |
Parking Light | 2825 | Buy 2825 |
Trunk Light | 6418 | Buy 6418 |
Want to upgrade everything at once?
Shop Complete LED Kit for 1999 Jaguar XJ8How Long Do 1999 Jaguar XJ8 Headlight Bulbs Last?
Standard halogen headlights on the 1999 Jaguar XJ8 have an expected lifespan of 500 to 1,000 hours, which works out to roughly 2 to 3 years of normal use. Signs of a failing halogen bulb include noticeably dimmer output, a yellowish tint compared to the other headlight, or intermittent flickering. At 27 years old, the original bulbs on your XJ8 are likely overdue for replacement. Even if they still illuminate, reduced brightness significantly impacts nighttime safety. When one headlight burns out, replace both sides at the same time. Bulbs from the same batch age at similar rates, and mismatched brightness is distracting to oncoming drivers.
What Bulbs Are Compatible with the 1999 Jaguar XJ8?
The H7 low beam bulb on the 1999 Jaguar XJ8 is a specific fitment. There are no widely recognized cross-compatible alternatives, so make sure to purchase the exact H7 size. Using the wrong bulb size can cause improper beam patterns that reduce your visibility and blind other drivers. It can also cause overheating inside the headlight housing, potentially warping the plastic lens or reflector. Always verify the bulb number before purchasing.
1999 Jaguar XJ8 Headlight FAQ
Did Jaguar XJ8 Bulb Sizes Change Over the Years?
Over its production run from 1998 to 2009, the Jaguar XJ8 has seen bulb size changes in the Low Beam, Fog Light and Brake Light positions. The 1999 model uses the earlier bulb specification that was in place before the change around 2008. Always verify the exact bulb size for your specific 1999 model year using the chart above, as using the wrong size can result in poor fitment or reduced light output.
Other XJ8 Years
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Other Vehicles That Use H7 LED Bulbs
These vehicles from other makes also use a H7 LED low beam bulb: