Kenworth T680 high beam headlight bulbs use 9005XS size while low beam headlight bulbs use H11 or D2S size. The replacement chart covers 2013 to 2015 vehicle production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9005XS is the sole high beam bulb type across all three listed model years (2013-2015) of the Kenworth T680. It is a single-filament halogen bulb operating at 12V and 65W, built to the ANSI standard used in the United States and Canada. The "XS" designation refers to its straight 180-degree base orientation, which distinguishes it from other variants in the 9005 family.
The low beam position on the Kenworth T680 (2013-2015) accommodates two distinct bulb types depending on the headlamp system installed at the factory. Vehicles fitted with halogen capsule headlamps use the H11 bulb, while those equipped with HID headlamps use the D2S bulb. These two types are not interchangeable.
The H11 is a single-filament halogen bulb rated at 12V and 55W, using a PGJ19-2 base. It conforms to the ECE standard, which governs lighting equipment across Europe and many other markets, though it also carries approval for use in the United States.
The D2S is a high-intensity discharge (HID) xenon bulb rated at 85V and 35W, using a P32d-2 base. Unlike halogen bulbs, it produces light through an electrical arc between two electrodes within a xenon gas-filled capsule rather than through a heated filament. It is designed specifically for projector-type housings and requires a separate external ignitor to initiate the arc.
The wattage difference between the D2S (35W) and the H11 (55W) does not reflect a proportional difference in light output. HID technology produces significantly more lumens per watt than halogen, which accounts for the lower wattage rating despite the higher operating voltage of 85V.
The 9005XS and H11 both operate on a standard 12V automotive electrical system, making them compatible with conventional halogen headlamp circuits. The D2S, by contrast, requires a dedicated high-voltage ballast and ignitor assembly, meaning the two low beam configurations rely on fundamentally different electrical architectures.
Because the low beam fitment depends on the headlamp housing type rather than the model year alone, the 2013-2015 T680 does not have a single universal low beam bulb. Substituting an H11 for a D2S, or vice versa, would be incompatible due to differences in base type, operating voltage, and housing design.