ST64 Edison Vintage Filament Bulb E27 40W — Triangle Filament, 2700K Extra Warm White, 220V, 50,000h
ST64 Edison-style LED filament bulb with a triangle squirrel-cage filament, E27 screw cap, 40W, and an extra warm amber glow at 2700K. The ST64 elongated pear shape is the most recognisable silhouette in the vintage filament range — the triangle filament inside the clear glass creates a bold, architectural light source that is as much a design object as a functional bulb. Integrated LED — no bulb to buy separately.
Technical specifications
| Light source | Integrated LED filament — non-replaceable |
| Bulb shape | ST64 (elongated pear / Edison, clear glass) |
| Filament style | Triangle / squirrel cage |
| Cap type | E27 (large screw) |
| Wattage | 40W |
| Luminous flux | 250–499 lm |
| Colour temperature | 2700K extra 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 Triangle Filament — The Edison icon, squirrel-cage geometry & why 2700K is the right temperature for this bulb
The ST64 is the bulb that defined the Edison aesthetic — its elongated pear shape, clear glass, and visible filament are the reference point for the entire vintage lighting movement. The triangle filament (also called squirrel-cage) is the most visually complex filament style: instead of a single straight or spiral element, the filament forms a triangular geometric structure inside the glass, creating a multi-point light source that casts a warm, faceted glow in all directions. In an open pendant drop or a cage fitting, the triangle filament is fully visible from every angle — it reads as a piece of craft inside the glass, not just a functional component. The ST64 shape is longer and more tapered than a standard A60 or G80, which gives it a distinctive silhouette that is recognisable even in a crowded room. At 40W and 2700K, the light is extra warm — deeper amber than a standard 2700–3000K warm white, closer to the colour of a traditional incandescent. This is the right choice for spaces where atmosphere is the priority: a dining room pendant, a living room floor lamp, a bar or hospitality setting where the quality of the light is as important as the quantity. At 250–499 lm, the output is ambient rather than functional — supplement with other light sources if task lighting is also needed.
Direct E27 screw-in replacement — no tools required. Rated at 50,000 hours. IP20 — dry indoor use only. Check dimmability before ordering if your fitting has a dimmer switch. Browse our full LED Bulbs range or read our home lighting ideas guide for inspiration on using Edison filament bulbs as statement light sources.
Common questions
What is the difference between the ST64 triangle filament and a standard straight filament?
+
A straight filament runs in a single vertical line — clean and understated. The triangle filament forms a geometric triangular structure inside the glass — more complex, more ornamental, and more visually striking. In an open fitting where the bulb is fully visible, the triangle filament creates a multi-point light source that catches the eye and reads as a deliberate design choice. Choose straight filament for restraint; choose triangle for statement.
Is 2700K noticeably warmer than standard warm white bulbs?
+
Yes — 2700K is at the warm end of the warm white range. Standard warm white LED bulbs are often rated at 2700–3000K, which means some are closer to 3000K (a cooler, more neutral white). A bulb rated specifically at 2700K will produce a noticeably deeper amber glow — closer to the colour of a traditional incandescent or halogen bulb. This is the right choice for spaces where you want the warmest, most atmospheric light possible.
Will the ST64 fit inside a standard pendant shade or does it need an open fitting?
+
The ST64 is longer than a standard A60 bulb — check the internal depth of your shade before ordering. In a deep drum or empire shade, the ST64 will fit but the elongated tip may be close to the shade opening. In a shallow or tight-fitting shade, the ST64 may protrude. The ST64 is designed for open fittings where the full silhouette is visible — a bare pendant drop, a cage fitting, or a lamp without a shade. In an enclosed shade, the distinctive shape is hidden and a standard A60 would be more practical.
Is 40W LED equivalent to a 40W incandescent in terms of brightness?
+
No — LED wattage is not directly comparable to incandescent wattage. A 40W LED filament produces significantly more light than a 40W incandescent. This 40W LED produces 250–499 lm, which is closer to the output of a 25–40W incandescent in terms of lumen output, but the LED efficiency means it uses far less energy. If you are replacing a 40W incandescent, this bulb will produce a similar or slightly higher lumen output at a fraction of the running cost.
Can I use the ST64 in a floor lamp or table lamp as a statement piece?
+
Yes — the ST64 works particularly well in floor lamps and table lamps used without shades, where the elongated silhouette and triangle filament are fully visible. In a floor lamp with an exposed E27 socket, the ST64 becomes the visual centrepiece of the fitting. Ensure the lamp base has an E27 socket and that the socket height allows the ST64 to sit without the tip touching any part of the base or surround. At 2700K, the warm amber glow suits living rooms and bedrooms where atmosphere is the priority.
Browse our full LED Bulbs collection or read our home lighting ideas guide. Free delivery on orders over €50 — easy returns if it’s not the right fit.
