Factory bulb sizes and relevant BulbFacts-tested replacement evidence for the 2008 Kia Optima.
Source-listed fitment data supplied by CarBulbGuide. Confirm the installed bulbs and configuration before ordering.
Low beam
H11B
High beam
H1
Factory setup
Factory headlight setup not identified
Representative car or sedan image
Best headlight upgrades
These products were physically tested by BulbFacts, but the tests were not performed in this exact vehicle unless a card explicitly says otherwise.
Factory headlight setup not identified
Low Beam: H11B · High Beam: H1
Best direct replacement
OSRAM Night Breaker 200
High Beam H1
Estimated price$20-34
BulbFacts testedCorrect bulb size
Best Standard Reflector Upgrade
The Night Breaker 200 is the top standard-wattage reflector recommendation at the time of review. Anything scoring higher in the reflector chart uses much higher wattage, while the NB200 keeps the simple drop-in halogen format.
BulbFacts testedCorrect bulb sizeprojector housing only
Best Premium Distance
The Morimoto XB Elite remains the premium performance benchmark from the current HID recommendations. It tested as one of the strongest 35W projector-focused HID kits and is the better fit when you want a complete, higher-quality conversion kit instead of a generic marketplace option.
A matching bulb size identifies fitment; it does not by itself prove optical compatibility or make a conversion a vehicle-specific recommendation. Use the LED upgrade path only with a reflector housing and confirm beam pattern and glare after installation. Use the HID upgrade path only with a projector housing; it is not a reflector-housing recommendation.
Other bulbs
Available exterior and interior lighting data for this model year.
Cargo / Trunk Light
6418Verify installed bulb
Center High Mount Stop Light
921Verify installed bulb
Courtesy Light
168Verify installed bulb
Dome Light
6418Verify installed bulb
Front Side Marker
168Verify installed bulb
Front Turn Signal
2357AVerify installed bulb
License Plate Light
168Verify installed bulb
Parking Light
2357AVerify installed bulb
Rear Side Marker
168Verify installed bulb
Rear Turn Signal
2357Verify installed bulb
Reverse Light
921Verify installed bulb
Technical details and sources
Confirm the installed bulb, connector, housing, and factory system before ordering.
Position
Bulb or system
Fitment status
Low BeamFactory system not specified
H11B
Bulb size confirmed
High BeamFactory system not specified
H1
Bulb size confirmed
Other Kia Optima years
Each model year opens its own BulbFacts record. Bulb sizes and factory systems are not carried over from adjacent years.
Fitment note: Verify the installed bulb, connector, housing, and factory system before ordering. A bulb-size match is not automatically a conversion recommendation or proof of vehicle-specific testing.
