The H7 bulb was introduced as an improvement on the H4 bulb. The “H” refers to halogen. These bulbs contain a tungsten filament enclosed in a halogen gas-filled quartz capsule. This allows higher ...

modern halogen bulbs are much brighter and longer lasting than they used to be. They use a number of H fittings (for example, H4 bulbs), so make sure you know which one you need. We’ll look at Xenon ...