The 9045 automotive bulb is a halogen bulb with a single filament and a P20d base. It has a nominal power of 12 volts and 45 watts, producing 1000 lumens and a color temperature of 3200K. This bulb can be used as a replacement part for fog lights and some high beam headlights. It is not interchangeable with other bulb types. The 9045 bulb has a typical lifespan of 400-500 hours. Its name is deciphered by the first two digits indicating the bulb's diameter in millimeters, and the last two digits indicating the bulb's wattage. The 9045 bulb is used in reflector headlights.