Can H1 and H7 Bulbs Be Interchanged?

[VivienneRose]

No, they cannot be interchanged. H1 and H7 are two different types of bulbs, both available in halogen and xenon versions. The H1 has a single terminal and uses the bulb casing for grounding, while the H7 has two terminals. Xenon bulbs are categorized into eight types based on their form: high beam with lens, low beam with lens (these two types are typically used in OEM xenon systems, such as in PST and Audi models), H1 (high beam bulb), H3 and H11 (fog lights). Lighting Introduction: High beam with lens, low beam with lens (these two types are generally used in OEM xenon systems, such as in PST and Audi models). Common bulb types include: H1 (high beam bulb), H3 (fog light), H4 (a combined high/low beam bulb), H7 (mostly used for low beams, but also for high beams in some models, such as the Audi A6). H3 Introduction: The H3 is a special type, most commonly used in Japanese cars. The H4 is the most illustrative, being a dual-filament triangular bulb where both low and high beams are integrated into one bulb. The standard wattage is 55W for low beam and 60W for high beam; there are now higher-wattage versions available, with 90W for low beam and 100W for high beam.