Sylvania Superia RefLED GU10 Bulb, Dimmable, 850 Lumen, Cool White

This Sylvania Superia RefLED GU10 bulb is a dimmable LED spotlight bulb giving out 850 lumens of cool white light. It's built to recreate the look of a traditional halogen GU10 spotlight, with a full glass lens and a backlight effect similar to a halogen dichroic lamp, while running on a fraction of the power.

Key features

• Dimmable — compatible with LED-rated dimmer switches
• 850 lumen output, cool white light
• Full glass design so there's no clash of colour or finish between bulb and fitting
• Rated for 25,000 hours of life
• High colour rendering, CRI80, for natural-looking colours
• Rated for over 100,000 switching cycles
• COOLFIT technology to guard against overheating
• Standard GU10 twist-and-lock base, 5 year warranty

What this bulb is best for

The cool white colour and high 850 lumen output make this a strong choice for kitchens, bathrooms, home offices and any room where a brighter, whiter working light is preferred over a warm amber tone. Because it's dimmable, it also suits rooms where you want the flexibility to turn the light down for evening use, provided your dimmer switch is LED-compatible.

How to fit it

1. Turn off the power to the fitting at the switch or consumer unit before changing any bulb
2. Let the old bulb cool fully before handling it
3. Twist the old GU10 bulb anti-clockwise a quarter turn to release it from the fitting
4. Push the new Sylvania GU10 bulb into the fitting and twist it clockwise a quarter turn to lock it in
5. Restore power and test the light. GU10 bulbs run directly on mains voltage, so no transformer or separate driver is needed

Frequently asked questions

Do I need a special dimmer switch for this bulb?

For the best results, yes. Use an LED-compatible (trailing-edge) dimmer switch. Fitting a dimmable LED bulb to an old leading-edge dimmer designed for halogen bulbs can cause flickering, buzzing or a shortened bulb life.

What wattage is this bulb?

Sylvania publishes this lamp's lumen output (850lm) but doesn't state an exact wattage figure for this specific SKU on the data we could verify, so we haven't guessed a number rather than risk giving you the wrong one.

How long will this bulb last?

Sylvania rates this lamp for 25,000 hours of life and more than 100,000 switching cycles.

Is this a warm or cool light?

This is a cool white bulb, giving a brighter, whiter light than a warm white (3000K) bulb — better suited to kitchens and task areas than to a cosy living room.

Technical specification

More GU10 bulbs

• JCB LED GU10 Bulb, 5W, 345 Lumen, Warm White 3000K, Pack of 4
• JCB LED GU10 Bulb, 5W, 370 Lumen, Daylight 6500K
• Shop the full GU10 bulb collection