GU10 LED Bulb 5W 4000K Cool White 460lm Dimmable 74mm Extended Barrel — Integrated LED
A dimmable GU10 LED bulb at 5W, 460 lumens, 4000K cool white, with a 90° wide beam and a 74mm extended barrel. Push-and-twist fit. Designed for deep recessed downlight fittings where a standard 58mm GU10 sits too far back. Rated for 25,000 hours. Integrated LED — no bulb to buy.
Technical specifications
| Light source | Integrated LED — fixed, non-replaceable |
| Cap type | GU10 — push-and-twist |
| Wattage | 5W — equivalent to 50W halogen |
| Luminous flux | 460lm |
| Colour temperature | 4000K — cool white |
| Beam angle | 90° — wide flood |
| Dimmable | Yes — trailing edge (LED) dimmer required |
| Barrel length | 74mm — extended (standard = 58mm) |
| Diameter | ø50mm |
| Voltage | 240V |
| Lifetime | 25,000 hours |
| Energy rating | A+ |
GU10 LED Bulb 74mm — Extended Barrel, Dimmable, Deep Downlight Fit
Standard GU10 bulbs measure approximately 58mm in height. This bulb has a 74mm extended barrel — designed for deep recessed downlight fittings where a standard bulb sits too far back inside the housing, causing uneven light distribution or a visible dark ring around the beam. If your downlight has a deep housing and a standard GU10 produces a shadowed or uneven result, this extended barrel format is the correct solution. At 460lm from 5W, output is slightly lower than a standard 5W GU10 (typically 500–600lm) — a result of the extended barrel geometry. The 4000K cool white tone is neutral and clear, suited to kitchens, bathrooms, and task areas. Dimmable — use a trailing edge (LED-compatible) dimmer switch. Standard leading edge dimmers may cause flickering. If you are not using a dimmer switch at all, a non-dimmable GU10 alternative may perform more consistently.
Before ordering, measure the depth of your downlight housing to confirm the 74mm barrel fits without obstruction. Confirm the cap type is GU10 (push-and-twist). Browse the full LED bulbs collection or read our indoor lighting guide.
Common questions
Why does this bulb have a longer barrel than standard GU10s?
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This bulb has a 74mm barrel versus the standard 58mm. It is designed for deep recessed downlight fittings where a standard bulb sits too far back inside the housing, causing uneven light distribution or a visible dark ring. If your downlight has a deep housing, this extended barrel ensures the bulb sits at the correct depth. Measure your housing depth before ordering to confirm compatibility.
Can this be dimmed, and what dimmer switch do I need?
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Yes — this bulb is dimmable. Use a trailing edge (LED-compatible) dimmer switch for best results. Standard leading edge dimmers may cause flickering or buzzing. Trailing edge dimmers are usually labelled TE or LED on the switch plate. If you are not using a dimmer switch at all, a non-dimmable GU10 alternative may perform more consistently — contact us for advice.
Which fittings does this work with?
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Designed for GU10 (push-and-twist) deep recessed downlight fittings. Before ordering, confirm both the cap type (GU10) and the housing depth (minimum 74mm clearance). This bulb produces 4000K cool white — a clear, neutral tone suited to kitchens, bathrooms, and task areas. Browse our LED bulbs collection for other colour temperatures and barrel lengths.
Is 4000K cool white suitable for a living room or bedroom?
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4000K cool white will feel clinical in a living room or bedroom — it is not the right choice for atmospheric or relaxation lighting. For those spaces, 2700K extra warm white or 3000K warm white is more appropriate. 4000K is best suited to kitchens, bathrooms, home offices, and task areas where visual clarity matters more than ambience.
Why is the lumen output lower than a standard 5W GU10?
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This bulb delivers 460lm versus the 500–600lm typical of a standard 5W GU10. The extended 74mm barrel geometry affects the optical path, which results in slightly lower measured lumen output. In practice, the difference is not perceptible in normal use — the extended barrel ensures the bulb sits at the correct depth in a deep housing, which produces better light distribution than a standard bulb sitting too far back.
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