Vintage Spiral Filament Bulb ST64 E27 40W — Warm White 2700–3000K, 220V
ST64 teardrop-shaped bulb with a decorative spiral LED filament, E27 screw cap, 40W, and a warm amber glow at 2700–3000K. The spiral filament inside the elongated ST64 envelope creates a more complex visual pattern than a straight filament — ideal for exposed pendant drops and open cage fittings where the bulb is the centrepiece. Bulb included.
Technical specifications
| Light source | Integrated LED filament — non-replaceable |
| Bulb shape | ST64 (Edison / teardrop, clear glass) |
| Filament style | Spiral / helix |
| Cap type | E27 (large screw) |
| Wattage | 40W |
| Colour temperature | 2700–3000K warm white |
| Voltage | 220–240V (standard mains) |
| Rated lifespan | 50,000 hours |
| Dimmable | Verify before ordering if you have a dimmer switch |
| IP rating | IP20 — dry indoor use only |
| Certifications | CE |
ST64 Spiral Filament — Shape contrast, visual character & placement
The combination of the ST64’s elongated teardrop shape and a spiral filament creates a distinctive visual tension: the tall, tapered glass envelope frames the coiled helix in a way that reads as both architectural and ornamental. Where the G80 spiral sits symmetrically inside a round globe, the ST64 spiral stretches vertically through the glass — the filament appears to float inside the bulb, visible from all angles. This makes it particularly effective in single bare pendant drops and industrial wall lights where the bulb hangs at eye level and the full silhouette is on display. At 40W and 2700–3000K, the light output is warm and ambient — suited to living rooms, dining areas, and bedrooms where mood matters more than brightness. It is not a task light; for functional illumination, pair it with additional sources. The omnidirectional filament casts a soft glow in all directions with no harsh shadows.
Direct E27 screw-in replacement — no tools or rewiring required. Rated at 50,000 hours and significantly more energy-efficient than a true incandescent of equivalent brightness. IP20 — dry indoor use only, not suitable for bathrooms or outdoor fittings. Check dimmability before ordering if your fitting has a dimmer switch. Explore our full Light Bulbs range or read our interior lighting tips for inspiration on styling with filament bulbs.
Common questions
What is the difference between the ST64 spiral and the G80 spiral filament?
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Both use a spiral filament, but the glass envelope is different. The G80 is a round 80mm globe — the spiral sits symmetrically inside a sphere. The ST64 is a tall teardrop shape — the spiral stretches vertically through the glass, giving it a more elongated, architectural look. Choose G80 for a rounder, more classic decorative effect; choose ST64 for a taller, more dramatic silhouette in pendant drops and wall lights.
Is the spiral filament more fragile than a straight filament?
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No — LED filaments, whether straight or spiral, are solid-state components with no moving parts. They are significantly more robust than traditional incandescent filaments, which could break from vibration or impact. The spiral shape is purely aesthetic and does not affect durability or lifespan.
Will this bulb work in a fitting with a reflector or shade?
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It will work electrically in any E27 fitting, but the spiral filament effect is only visible in open fittings. In a fitting with a reflector, enclosed shade, or opaque cover, the decorative filament is hidden and a standard frosted LED globe would be a more practical choice. This bulb is designed to be seen.
How much heat does a 40W LED filament bulb produce?
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LED filament bulbs run significantly cooler than true incandescent bulbs of equivalent brightness. The glass envelope will warm up during use but should not be touched while lit or immediately after switching off. This is normal and does not affect safety under standard indoor use conditions. The lower heat output also makes LED filaments safer in fittings with fabric shades or near flammable materials.
Can I use this bulb outdoors in a covered porch or garden lantern?
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No — this bulb is rated IP20 and is suitable for dry indoor use only. For outdoor use, even in a covered porch or lantern, you need a fitting rated IP44 or higher that fully encloses and protects the bulb from moisture. The bulb itself does not carry an outdoor IP rating and should not be exposed to humidity or condensation.
Explore our full Light Bulbs collection or read our interior lighting tips. Free delivery on orders over €50 — easy returns if it’s not the right fit.
