G9 bulb base reference
G9 is a mains-voltage loop-pin capsule base, recognizable by its two small loop-shaped pins spaced 9mm apart.
Exact specs
| Designation | G9 (loop bi-pin) |
|---|---|
| Pin spacing | 9 mm (center-to-center) |
| Pin form | Looped / folded wire |
| Voltage | Mains (120V / 240V) — no transformer needed |
| Typical wattage | 2W–25W LED equivalent |
What fixtures commonly use it
G9 is common in compact pendant lamps, wall sconces, bathroom vanity bars, and decorative table lamps — particularly in European-style fixtures.
What it's interchangeable with
G9 LED capsules replace G9 halogen capsules directly with no transformer change. Confirm lamp wattage and color temperature match your preference.
What it's NOT interchangeable with
G9 is not compatible with G4 (different pin spacing, low-voltage), GU10 (mains twist-lock), or any screw base.
Common mistakes
- Confusing G9 with G4 — they visually appear similar but G4 runs on 12V.
- Touching G9 halogen bulbs with bare hands — oils reduce lifespan.