ST64 Star Filament Bulb E27 40W — Extra Warm White 2700K, 50 000h Lifespan
A conical ST64 Edison bulb with a decorative star-shaped filament, 40W, E27 cap, 2700K extra warm white tone and a rated lifespan of 50 000 hours. CE certified for EU and UK mains (220–240V). Bulb sold individually — fitting not included.
Technical Specifications
| Light source | Incandescent filament — replaceable |
| Cap / Socket | E27 (standard Edison screw) — also fits E26 |
| Bulb shape | ST64 (conical / teardrop) |
| Filament shape | Star (decorative) |
| Wattage | 40W |
| Luminous flux | 250–499 lm |
| Colour temperature | 2700K — extra warm white |
| Voltage | 220–240V / 50Hz |
| Rated lifespan | 50 000 hours |
| Dimmable | Check product variant — not all versions are dimmable |
| Certifications | CE (EU / UK) |
ST64 Star Filament — Longevity, Warmth, Decorative Impact
What sets this bulb apart from a standard vintage Edison is the combination of the ST64 teardrop silhouette and the star filament — a shape that becomes a focal point when the bulb is lit and visible. At 2700K, the light sits at the warmer end of the white spectrum, closer to candlelight than daylight, which makes it particularly effective in spaces where you want to slow the pace: dining rooms, living rooms, bedside lamps, or a reading corner. The 50 000-hour rated lifespan is a meaningful practical advantage over standard incandescent bulbs, which typically last 1 000–2 000 hours. That said, this is still an ambient light source — at 40W and 250–499 lumens, it is not designed to replace a ceiling fitting or illuminate a work surface.
This bulb is best used in open or clear-glass fittings where the ST64 shape and star filament remain visible: cage pendants, globe shades, exposed-socket wall lights, or industrial-style floor lamps. Grouping two or three across a dining table or along a kitchen island creates a layered, cohesive effect without requiring a single high-output source. Browse our LED bulbs collection for compatible options, or read our interior lighting tips for placement ideas.
Common Questions
What does ST64 mean — and does the shape matter?
+
ST64 refers to the bulb’s shape: a conical “teardrop” silhouette, 64mm at its widest point. It is one of the most recognisable vintage bulb profiles and is wider and taller than a standard A60 globe. The shape matters if your fitting has a narrow neck or a small shade opening — check the diameter of your fitting before ordering to confirm the ST64 will fit through.
Is 50 000 hours realistic for an incandescent-style bulb?
+
The 50 000-hour rating applies to the LED filament technology used in this bulb — it mimics the look of a traditional incandescent but uses LED filament strips rather than a tungsten wire. This is why the lifespan is dramatically longer than a classic incandescent (1 000–2 000h). At 4 hours of use per day, 50 000 hours equates to roughly 34 years.
Will the star filament be visible through my shade?
+
Only through clear or open glass. With a fabric, frosted, or opaque shade, you will see the warm glow but not the star shape. For the full decorative effect, use this bulb in a cage pendant, a clear glass globe, or an open-socket fitting where the bulb is fully exposed. It is specifically designed to be seen.
2700K — how does that compare to a standard warm white LED?
+
Most standard warm white LEDs sit at 3000K, which reads as a clean, neutral warm tone. At 2700K, this bulb is noticeably deeper and more amber — closer to the glow of a halogen or a traditional incandescent. If you are replacing an existing bulb and want to match the tone, check the Kelvin rating on your current bulb. 2700K is the right choice for a cosy, intimate atmosphere; if you prefer a brighter, crisper white, look for a 3000K or 4000K option instead.
Can I use this bulb outdoors or in a bathroom?
+
No. This bulb has no IP rating and is not suitable for outdoor use or damp environments such as bathrooms without enclosed, IP-rated fittings. For outdoor or bathroom use, ensure the fitting itself provides the required IP protection (IP44 minimum for bathrooms, IP65 for exposed outdoor locations). The bulb itself must remain dry.
Explore our full range of LED Bulbs or find a compatible fitting in our Pendant Lights collection. Free delivery on orders over €50. 30-day returns.
