Diamond Spiral Filament LED Bulb E27 4W — 2700K Extra Warm White, Geometric Vintage Design
A decorative E27 LED bulb with a diamond-shaped glass body and a spiral filament, delivering an extra warm 2700K amber tone at 4W. CE, RoHS and CCC certified for EU and UK mains (220–240V). Bulb sold individually — fitting not included.
Technical Specifications
| Light source | LED filament — spiral, replaceable |
| Cap / Socket | E27 (standard Edison screw) — also fits E26 |
| Bulb shape | Diamond (faceted geometric body) |
| Filament shape | Spiral (decorative) |
| Wattage | 4W (LED equivalent to ~40W incandescent) |
| Colour temperature | 2700K — extra warm white |
| Voltage | 220–240V / 50Hz |
| Glass | Clear — faceted diamond body |
| Certifications | CE (EU / UK), RoHS, CCC |
Diamond Filament Bulb — Geometry, Refraction, Decorative Presence
What distinguishes this bulb from other vintage filament designs is the glass body itself. Where a standard ST64 or globe bulb has a smooth, rounded surface, the diamond shape introduces flat facets that catch and refract light differently at each angle — creating subtle prismatic reflections on surrounding surfaces when the bulb is lit. The spiral filament inside reinforces the visual complexity: rather than a single straight or looped wire, the coiled form glows as a continuous helix, visible through the clear glass from every direction. At 2700K, the output is deep amber-warm — closer to candlelight than to standard warm white LEDs — which amplifies the decorative effect rather than competing with it. At 4W, this is an ambient light source, not a task light: it is chosen for what it looks like as much as for the light it produces.
This bulb works best in open or clear-glass fittings where both the diamond silhouette and the spiral filament remain fully visible: exposed-socket pendants, cage fittings, open-arm chandeliers, or bedside lamps with a clear glass shade. It is particularly effective in pairs or groups — two over a dining table or three across a bar-style pendant create a cohesive, jewel-like effect. Avoid using it inside opaque or fabric shades where the geometry is hidden. Browse our pendant lights collection for compatible open fittings, or read our home lighting ideas guide for styling inspiration.
Common Questions
Does the diamond shape affect how the light is distributed?
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Yes — the faceted glass body refracts light differently than a smooth globe or ST64. Each flat face of the diamond catches the filament glow at a slightly different angle, creating subtle prismatic reflections on nearby walls and ceilings. The effect is most visible in a dark or dimly lit room. In a brightly lit space, the refraction is less noticeable. This is a feature of the design, not a flaw — but it means the bulb performs best in intimate, low-light settings rather than as a primary light source.
Is this an LED bulb or a traditional incandescent?
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This is an LED filament bulb — it uses LED technology to replicate the visual appearance of a traditional incandescent spiral filament, but at 4W rather than the 40W a comparable incandescent would consume. The result is the same warm amber glow and visible filament effect, with significantly lower energy use and a much longer lifespan. It is not a traditional tungsten incandescent.
Will this bulb fit inside a standard pendant shade?
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It depends on the shade. The diamond body is wider than a standard A60 bulb and may not fit through narrow shade openings or inside small enclosed shades. Measure the widest point of the diamond body and compare it to the internal opening of your shade before ordering. For best results, use this bulb in an open or cage-style fitting where the full diamond silhouette is visible — enclosing it inside a shade defeats the purpose of the decorative geometry.
How does the spiral filament compare to a straight or looped filament?
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A straight filament (like a classic Edison T10 or ST64) reads as a single glowing line — elegant and minimal. A looped or heart filament creates a recognisable shape. The spiral filament in this bulb is a continuous helix that fills the glass body with a three-dimensional glow — it appears equally complex from any viewing angle and creates a denser, more intricate light pattern than a flat filament design. It is the most visually active of the filament styles.
Can I use this bulb in a chandelier with multiple arms?
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Yes — provided the chandelier has E27 sockets and the arm spacing allows for the diamond body width without the bulbs touching each other or the frame. In a multi-arm chandelier, using identical diamond spiral bulbs across all sockets creates a cohesive, jewel-like effect. Check the socket spacing and clearance in your chandelier before ordering multiple units. Browse our chandeliers collection for compatible fittings.
Find compatible open fittings in our Pendant Lights or Chandeliers collection. Free delivery on orders over €50. 30-day returns.
