The H2 bulb is a single beam lamp with one filament and a P14.5s base. It utilizes halogen technology and is commonly used as a replacement for fog lights or auxiliary lights. It has a nominal power of 12 volts and 55 watts, producing around 1350 lumens and a color temperature of 3200K. Its name is deciphered by the letter H, which stands for halogen, and the number 2, which indicates its size. The H2 bulb has a lifespan of approximately 400-500 hours. It is interchangeable with other bulb types such as H2R and H2C. The H2 bulb is typically used in reflector headlights.