1. Product Overview
The Philips LED GU10 bulb is an energy-efficient replacement for traditional 50W halogen GU10 bulbs. Featuring a classic glass design, this bulb is engineered to replicate the familiar lighting experience of halogen bulbs while offering significant energy savings and an extended lifespan. It provides a Soft White WarmGlow, transitioning from 2700K to 2200K when dimmed, and is fully dimmable. With instant-on light and a standard GU10 base, it is ideal for recessed and track lighting applications.
Key Features:
- Energy Efficient: 4.5W LED replaces 50W halogen, saving up to 80% in energy costs.
- WarmGlow Feature: Dims from 2700K (Soft White) to 2200K for a cozy ambiance.
- Dimmable: Compatible with most dimmers for adjustable light levels.
- Long Lifespan: Lasts up to 25,000 hours or over 22 years (based on 3 hours/day usage).
- Instant-On: Provides full brightness immediately with no warm-up time.
- Beam Angle: 35-Degree beam for focused illumination.
- Base Type: Standard GU10 base for easy installation.
2. Safety Information
Please read and understand all instructions before installing or using this product. Failure to follow these instructions may result in electric shock, fire, or other hazards.
- Risk of Electric Shock: Always turn off power to the fixture at the circuit breaker before installation, removal, or inspection.
- Risk of Fire: Do not exceed the maximum wattage rating of the fixture. Ensure the bulb is suitable for the intended application.
- Compatibility: Use only with GU10 compatible fixtures. This bulb is designed for 120V AC power sources.
- Operating Temperature: Do not use in totally enclosed luminaires unless the bulb is specifically rated for such use, as this may shorten bulb life.
- Disposal: Dispose of used bulbs according to local regulations.
3. Installation
This Philips LED GU10 bulb is designed for easy replacement of existing GU10 halogen bulbs.
- Turn Off Power: Ensure the power supply to the light fixture is completely turned off at the circuit breaker or fuse box.
- Remove Old Bulb: Allow the old bulb to cool completely before touching. Gently push the old GU10 bulb into the fixture and twist counter-clockwise to unlock and remove it.
- Insert New Bulb: Align the two pins of the new Philips LED GU10 bulb with the holes in the fixture socket. Gently push the bulb into the socket and twist clockwise until it locks securely into place. Do not force the bulb.
- Restore Power: Turn the power supply back on at the circuit breaker.
- Test: Turn on the light switch to confirm proper operation.

Figure 1: Close-up of the Philips LED GU10 bulb, highlighting its two-pin base for easy installation.
4. Operating Instructions
This Philips LED GU10 bulb is designed for simple operation and enhanced comfort.
- Standard Operation: Simply turn on the light switch for instant, full brightness (2700K Soft White).
- Dimmable Functionality: When connected to a compatible dimmer switch, you can adjust the light output. As the bulb is dimmed, its color temperature will gradually shift from 2700K (Soft White) to a warmer 2200K, creating a cozy and inviting atmosphere.

Figure 2: Color Temperature Chart illustrating the range of light colors from warm amber to cool daylight. This Philips bulb features WarmGlow technology, shifting from 2700K to 2200K when dimmed.
5. Maintenance
Philips LED bulbs require minimal maintenance due to their long lifespan.
- Cleaning: Ensure the power is off and the bulb is cool before cleaning. Wipe the bulb with a soft, dry cloth. Do not use liquid or abrasive cleaners.
- Replacement: When the bulb reaches the end of its life, replace it following the installation steps outlined in Section 3.
6. Troubleshooting
If you experience issues with your Philips LED GU10 bulb, refer to the following common troubleshooting steps:
- Bulb Not Lighting Up:
- Check if the power supply to the fixture is on.
- Ensure the bulb is correctly seated and locked into the GU10 socket.
- Test the bulb in another working fixture to rule out a faulty bulb.
- Flickering Light:
- Ensure your dimmer switch is compatible with LED bulbs. Older dimmers designed for incandescent bulbs may cause flickering.
- Verify the bulb is securely installed.
- Flickering can also be caused by rapid responses to driver current, which Philips LED lighting minimizes.
- Light Too Dim or Too Bright:
- If using a dimmer, adjust the dimmer switch to your desired brightness level.
- Confirm the bulb's wattage equivalent (50W) and lumen output (380 lumens) are appropriate for your needs.
Video 1: Philips LED Better Eyecomfort Lighting. This video explains how Philips LED lighting minimizes variations in light output, reducing flicker and the stroboscopic effect for improved visual comfort.
Video 2: Philips LED Ultra Definition Bulbs. A brief overview of Philips LED Ultra Definition bulbs, showcasing their light quality.
7. Specifications
| Specification | Detail |
|---|---|
| Brand | Philips |
| Model Number | 566521 |
| Part Number | 471573 |
| Type of Bulb | LED |
| Bulb Base | GU10 |
| Wattage | 4.5 Watts |
| Incandescent Equivalent | 50 Watts |
| Voltage | 120 Volts |
| Brightness | 380 Lumens |
| Light Color | Soft White WarmGlow (2700K-2200K) |
| Special Feature | Dimmable |
| Beam Angle | 35-Degree |
| Material | Glass |
| Product Dimensions | 4.98 x 11.99 x 20.4 cm |
| Item Weight | 60 g |
| Lifespan | Up to 25,000 hours |
| Usage | Recessed and Track Lighting |
8. Warranty and Support
Philips products are manufactured to the highest standards. For specific warranty information and customer support, please refer to the packaging or visit the official Philips website.
Online Support: www.philips.com
9. Additional Product Information

Figure 3: Philips LED GU10 bulb in its packaging, emphasizing its WarmGlow and dimmable capabilities.

Figure 4: Philips EyeComfort logo, indicating the bulb is designed to be gentle on the eyes.

Figure 5: Infographic detailing the various benefits of Philips LED technology, including long lifetime, energy efficiency, and dimmability.

Figure 6: Philips' commitment to EyeComfort lighting, promoting light that is easy on the eyes for various activities.

Figure 7: A statement emphasizing the benefits of Philips EyeComfort lighting for eye health.

Figure 8: Philips LEDs provide comfortable, high-quality light, offering over 80% energy savings compared to traditional incandescent lamps.

Figure 9: Key benefits of Philips gentle light: instant on, high quality, and energy saving.

Figure 10: A visual representation of multiple Philips GU10 bulbs.





