The 4057 automotive bulb is a versatile replacement part that can be used in a variety of applications such as brake lights, turn signals, and parking lights. This bulb utilizes the halogen technology and has a single beam lamp with one filament. It is typically used in reflector headlights and has a lifespan of approximately 1-2 years.
4057 Light Bulb
BULB CROSS REFERENCE
The 4057 light bulb family is interchangeable with the following bulbs
The name of the bulb, 4057, is deciphered as follows: the first two digits (40) represent the wattage of the bulb (40 watts), while the last two digits (57) represent the base type (P21/5W). The base type for this bulb is P21/5W, which is a dual-contact bayonet base.
The nominal power for the 4057 bulb is 12.8 volts and 28/8 watts. It produces approximately 402 lumens and has a color temperature of 3200 kelvins. This bulb is interchangeable with other bulb types such as 3157, 4157, and 3057.