Kia Optima Parking Light Bulb Size

Additional Notes

• The 2357NA bulb is the most frequently specified parking light size across the Kia Optima lineup, appearing across model years 2001-2002, 2005-2008, 2011-2013, and 2017-2018.
• The 2357NA is an ANSI-standard dual-filament bulb with a BAY15d bayonet base and natural amber glass, rated at 12V with a high filament draw of 26.9W and a low filament draw of 8W.
• The natural amber glass of the 2357NA produces a yellow-tinted output without the use of a colored lens, which distinguishes it from the clear-glass 2357 variant.
• The 2357 shares the same BAY15d bayonet base and identical 12V, 26.9W/8W electrical ratings as the 2357NA, making the two physically interchangeable in terms of socket fit, though their light output color differs.
• The 2357 is noted as a brighter variant of the 1157, a common reference point in the BAY15d bulb family, meaning the two are not direct electrical equivalents despite sharing the same base type.
• The Kia Optima (2019) shifts to the 12961 bulb for vehicles produced from 05/04/2018 onward, representing a significant departure from the dual-filament BAY15d format used in prior model years.
• The 12961 is a Philips part number for a miniature wedge-style T10 bulb with a W2.1x9.5d base, rated at 12V and 5W, a single-filament design with substantially lower wattage than the 2357-series bulbs.
• The W2.1x9.5d wedge base of the 12961 is physically incompatible with the BAY15d bayonet socket used by the 2357 and 2357NA, meaning the two bulb families cannot be substituted for one another.
• For the 2017-2018 Optima, the 2357NA fitment is conditional on the presence of Single Projector-Type Headlamps, indicating that headlamp configuration is a relevant factor in parking light bulb selection for those years.
• The 2009-2010 Optima uses the clear-glass 2357 rather than the 2357NA specified for the surrounding model years, making those two years distinct in terms of the color output of the parking light.