H4 vs H7 Bulbs: Differences, Uses, and Which One You Need
H4 and H7 bulbs are the two most common halogen headlamp bulbs fitted to tractors, telehandlers, and farm vehicles in the UK. The H4 bulb is a dual-filament unit that provides both dipped and main beam from a single bulb. The H7 bulb is a single-filament unit that handles one beam function only. The two […]
Vehicle Bulb Types Explained: A Complete Reference by Code
A vehicle bulb is identified by an alphanumeric code that fixes its base shape, filament arrangement, wattage and rated voltage. The four most common families of code on UK road and agricultural vehicles are halogen headlamp bulbs (H-series), bayonet bulbs (P-series), capless wedge bulbs (W-series and T-series), and festoon bulbs (C-series). Each code has a […]