What's the difference between H1, H4, and H7 bulbs?

H1 is a single-filament low or high beam; H4 is a dual-filament high/low beam (common in older models); H7 is a single-filament low beam (common in European cars). The connectors are different and cannot be interchanged.

Is it legal to retrofit LED bulbs in halogen headlights?

It may be illegal in some regions—check local regulations. Retrofitting LEDs requires a decoder (anti-flicker) and proper heat dissipation.

Headlight Bulb Model Finder

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Brand

Model

Year

Common bulb models

H1 — Single filament low/high beam bulb55W

H4 — Dual filament high/low combined60/55W

H7 — Single filament low/high beam bulb55W

H8 — Fog light dedicated35W

H11 — Low beam / fog light55W

9005 — High beam (HB3)65W

9006 — Low beam (HB4)55W

D1S — HID with igniter35W

D3S — Mercury-free HID35W

7440 — Turn signal / position light (W21W)21W

PY21W — Amber turn signal21W

PW24W — White position light24W

Bulb specifications

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