The automotive bulb number 3456 is a single beam lamp with one filament. It utilizes halogen technology and has a nominal power of 12 volts and 21 watts. This bulb can be used as a replacement part for various applications such as parking lights, turn signal lights, and interior lights. It is commonly used in reflector headlights. The usual lifespan of this bulb is around 1-2 years. The name 3456 does not have a decipherable meaning. This bulb uses a P22d base. Its specs include a brightness of 400 lumens and a color temperature of 3100K. This bulb is interchangeable with other bulb types such as 3156 and 3057.