1. Introduction
This manual provides essential information for the safe and effective use of your Philips LED Frosted A21 Light Bulb. This bulb features a dimmable warm glow effect and EyeComfort Technology, designed to provide comfortable lighting for various environments. Please read these instructions carefully before installation and retain them for future reference.
2. Safety Information
- Risk of Electric Shock: Always turn off power to the fixture before installing, removing, or inspecting the bulb.
- Indoor Use Only: This bulb is designed for indoor use in dry locations. Do not use where directly exposed to water.
- Dimmable: This bulb is dimmable. Ensure your dimmer switch is compatible with LED bulbs for optimal performance and to avoid damage.
- Operating Temperature: Do not use in enclosed fixtures that restrict airflow, as this can shorten bulb life.
- Not for Philips HUE: This product is not compatible with Philips HUE smart lighting systems.
- Disposal: Dispose of bulbs according to local regulations.
3. Product Features
- Warm Glow Effect: Dimmable feature allows light to transition from bright functional light (2700K) to a cozy, warm glow (down to 2200K) as it dims.
- EyeComfort Technology: Meets strict criteria for flicker, strobe, glare, and color rendition to ensure visual comfort.
- High Brightness: Provides 2610 lumens of soft white light, equivalent to a 150W incandescent bulb.
- Energy Efficient: Uses significantly less energy (29W) compared to traditional incandescent bulbs.
- Long Lifespan: Designed to last up to 15,000 hours, reducing the need for frequent replacements.
- Standard Base: Features a standard medium base (E26) for compatibility with most fixtures.
4. Setup and Installation
- Turn Off Power: Before installation, ensure the power to the light fixture is turned off at the circuit breaker or wall switch.
- Remove Old Bulb: Carefully unscrew the existing bulb from the fixture.
- Install New Bulb: Screw the Philips LED Frosted A21 Light Bulb into the E26 base socket until it is finger-tight. Do not overtighten.
- Restore Power: Turn the power back on at the circuit breaker or wall switch.
- Test: Turn on the light switch to confirm the bulb is working correctly.

Image 1: Philips A21 LED Light Bulb with dimensions. The bulb measures 7.8 inches in height and 3.25 inches in width, featuring a standard E26 screw base.
5. Operating Instructions
The Philips LED Frosted A21 Light Bulb operates like a standard dimmable light bulb. Use a compatible dimmer switch to control its brightness and activate the Warm Glow effect.
- Turning On/Off: Use your existing wall switch to turn the light bulb on or off.
- Dimming: If connected to a compatible dimmer switch, adjust the dimmer control to increase or decrease the light intensity. As the light dims, the color temperature will shift from 2700K (soft white) to 2200K (warm glow), providing a cozier ambiance.
- Flicker-Free Operation: This bulb is designed for smooth, flicker-free dimming. If flickering occurs, ensure your dimmer is LED-compatible.
6. Maintenance
- Cleaning: Ensure the power is off before cleaning. Wipe the bulb with a soft, dry cloth. Do not use liquid cleaners or abrasive materials.
- Replacement: The bulb has a long lifespan. When replacement is eventually needed, follow the installation steps in Section 4.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Bulb does not light up. | No power to the fixture, bulb not screwed in properly, faulty bulb. | Check circuit breaker and wall switch. Ensure bulb is securely screwed in. Test bulb in another working fixture. |
| Bulb flickers or hums. | Incompatible dimmer switch, loose connection. | Ensure dimmer switch is compatible with LED bulbs. Tighten the bulb in the socket. |
| Dimming range is poor or inconsistent. | Incompatible dimmer switch. | Replace with an LED-compatible dimmer switch. |
8. Specifications
| Feature | Detail |
|---|---|
| Brand | Philips |
| Model Number | 558221 |
| Light Type | LED |
| Bulb Shape Size | A21 |
| Bulb Base | E26 (Medium) |
| Wattage | 29 Watts |
| Incandescent Equivalent | 150 Watts |
| Brightness | 2610 Lumens |
| Color Temperature | 2700K - 2200K (Dimmable Warm Glow) |
| Voltage | 120 Volts |
| Frequency | 60 Hertz |
| Color Rendering Index (CRI) | 80 |
| Lifespan | 15,000 Hours |
| Indoor/Outdoor Usage | Indoor |
| Special Feature | Frosted, Dimmable Warm Glow Effect, EyeComfort Technology |
| Material Type | Copper |
| Item Dimensions (W x H) | 3.25" x 7.8" |
| Weight | 0.4 Pounds |
| Certification | Energy Star |
9. Warranty and Support
For warranty information or technical support, please refer to the documentation included with your purchase or visit the official Philips lighting website. Keep your proof of purchase for warranty claims.





