Chevrolet Colorado Daytime Running Light Bulb Size

Additional Notes

• The Chevrolet Colorado daytime running light specifications cover model years 2004-2012 and reference two bulb types: the 4157NA and the 5702AK.
• The 4157NA is an ANSI-standardized dual-filament wedge bulb in the T25 form factor, rated at 12V with a 27W high filament and a 7W low filament, and features natural amber glass construction.
• The 5702AK is a Sylvania-designated variant of the ANSI 3157 bulb, sharing the same T25 dual-filament wedge form factor and 12V, 27W/7W electrical ratings, but uses an amber coating rather than natural amber glass to achieve its color output.
• The 4157NA appears in the Chevrolet Colorado for model years 2004, 2006, and 2009-2012, making it the more frequently specified of the two bulb types across this vehicle's fitment range.
• The 5702AK is specified for model years 2005, 2007, and 2008, indicating that the two bulb types alternate across certain production years rather than following a single continuous fitment period.
• Although the 4157NA and 5702AK share identical voltage and wattage ratings and the same T25 physical format, they are distinct part numbers and should not be treated as interchangeable without confirming the correct specification for a given model year.
• The difference between the two bulbs lies in how amber color is produced: the 4157NA uses naturally tinted amber glass in the envelope itself, while the 5702AK achieves its amber output through a surface coating applied over clear glass.
• The dual-filament design of both bulb types means each bulb carries two independent circuits within a single envelope, with the higher 27W filament and the lower 7W filament serving different lighting functions depending on the vehicle's wiring configuration.