Honda S2000 Daytime Running Light Bulb Size

Additional Notes

• The Honda S2000 uses the H1 bulb size for the daytime running light across all listed model years, spanning 2000-2009.
• The H1 is a single-filament halogen bulb, meaning it contains one tungsten filament and produces light through the halogen cycle, which redeposits evaporated tungsten back onto the filament to extend its operational life.
• The H1 bulb operates on a 12V electrical system and draws 55W of power, which are standard ratings for halogen automotive lighting applications.
• The H1 uses a P14.5s base, a single-pin connector type where the pin is centered at the base of the bulb, distinguishing it from multi-pin halogen bases such as H4 or H7.
• The H1 bulb is rated under the ECE standard, a regulatory framework used across Europe and much of the world, and it also holds approval for use in the United States and Japan.
• Because the H1 is a single-filament bulb, it serves one lighting function per unit. In the Honda S2000, that function is the daytime running light, and it is not shared with high beam or low beam operation within the same bulb.
• The P14.5s base is not interchangeable with other common halogen bases. Substituting a bulb with a different base type would result in an incompatible physical fit for the S2000 daytime running light socket.