Circle PLC
Circle PLC-18W Compact Fluorescent Light Bulb User Manual
Model: PLC
Product Overview
The Circle PLC-18W Compact Fluorescent Light Bulb is designed for efficient and long-lasting illumination. This 18-watt double tube bulb features a 4-pin G24q-2 base, providing 1200 lumens of warm white light at a color temperature of 2700K. With an average lifetime of 10,000 hours, it offers a reliable lighting solution for various applications.
Key features include:
- PLC18/4P T4 Warm White Color 4 Pin Base Compact Fluorescent Light Bulb
- 1200 lumens Light Output, 18 watts Energy Used, 10,000 hours Average Lifetime
- 4-Pin (GX24q-2) Base Type
- 82 CRI, 5.8" Length
- Manufactured to exacting standards, they feature top quality components and are guaranteed to perform like the original

Image: An 8-pack of Circle PLC-18W compact fluorescent light bulbs, showcasing the product quantity.
Setup and Installation
Before installation, ensure the power to the fixture is turned off at the circuit breaker to prevent electrical shock. These bulbs are designed for fixtures with a GX24q-2 4-pin base and operate on 100-120 Volts and 60 Hertz.
- Power Off: Locate the circuit breaker controlling the light fixture and switch it to the "OFF" position.
- Remove Old Bulb (if applicable): If replacing an existing bulb, carefully twist or pull the old bulb straight out from the fixture base. Allow it to cool if it was recently in use.
- Insert New Bulb: Align the 4 pins of the Circle PLC-18W bulb with the corresponding slots in the GX24q-2 base of your fixture. Gently push the bulb straight into the socket until it is firmly seated. Do not force the bulb, as this may damage the pins or the fixture.
- Secure Connection: Ensure the bulb is fully inserted and stable in the socket.
- Restore Power: Once the bulb is securely installed, return to the circuit breaker and switch the power back to the "ON" position.

Image: A detailed view of a single Circle PLC-18W bulb, highlighting its 4-pin GX24q-2 base for proper installation.
Always handle the bulb by its plastic base to avoid touching the glass tubes, which can reduce bulb life due to oils from your skin.
Operating Instructions
The Circle PLC-18W Compact Fluorescent Light Bulb operates immediately upon receiving power from the fixture. Once installed and power is restored, the bulb will illuminate.
- Turning On/Off: Control the light by using the standard wall switch connected to your fixture.
- Light Output: The bulb provides 1200 lumens of bright, warm white light (2700 Kelvin), suitable for various indoor environments.
- Warm-up Time: Like most fluorescent bulbs, a brief warm-up period may be observed before reaching full brightness, especially in cooler environments.
Maintenance
These compact fluorescent light bulbs are designed for long-term use with minimal maintenance. The average lifetime is approximately 10,000 hours under normal operating conditions.
- Cleaning: If the bulb accumulates dust, ensure the power is off and the bulb is cool. Gently wipe the glass tubes with a soft, dry, lint-free cloth. Do not use liquid cleaners directly on the bulb.
- Handling: Always handle the bulb by its plastic base. Avoid touching the glass tubes with bare hands, as oils can create hot spots and reduce bulb life.
- Replacement: Replace the bulb when it reaches the end of its life, indicated by flickering, dimming, or failure to illuminate. Follow the installation steps for replacement.
- Disposal: Compact fluorescent bulbs contain a small amount of mercury. Dispose of them according to local regulations for hazardous waste or take them to a designated recycling facility. Do not dispose of them in regular household trash.
Troubleshooting
If your Circle PLC-18W bulb is not functioning as expected, consider the following common issues and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Bulb does not light up. | No power to the fixture, bulb not seated correctly, faulty bulb, or faulty fixture. |
|
| Bulb flickers or dims. | Loose connection, incompatible dimmer (these bulbs are not dimmable unless specified), or bulb nearing end of life. |
|
| Bulb takes a long time to reach full brightness. | Normal warm-up characteristic of fluorescent bulbs, especially in cooler temperatures. | This is typically normal behavior and not a fault. Allow a few minutes for the bulb to reach full brightness. |
Specifications
| Attribute | Detail |
|---|---|
| Brand | Circle |
| Model Name | PLC |
| Light Type | Fluorescent |
| Wattage | 18 watts |
| Bulb Shape Size | T4 |
| Bulb Base | GX24q-2 (4-Pin) |
| Brightness | 1200 Lumens |
| Color Temperature | 2700 Kelvin (Warm White) |
| Color Rendering Index (CRI) | 82 |
| Average Life | 10,000 Hours |
| Product Dimensions | 1"W x 5.8"H |
| Item Weight | 1.26 pounds (for 8-pack) |
| Accepted Voltage/Frequency | 100 to 120 Volts and 60 Hertz |
| Unit Count | 8.0 Count |
| Material | Copper (for internal components) |
| UPC | 030465196017 |
Warranty Information
Specific warranty details for Circle products are typically provided by the manufacturer or included with the product packaging. For information regarding product warranty, please refer to the documentation supplied with your purchase or contact the manufacturer directly.
As per the purchase details, a return policy of 30 days for refund/replacement is available through the seller, Linden Products.
Customer Support
For further assistance, technical support, or inquiries regarding your Circle PLC-18W Compact Fluorescent Light Bulbs, please contact the seller or manufacturer.
- Manufacturer: Circle
- Seller: Linden Products
- Refer to your purchase documentation or the product listing on Amazon for direct contact information or support links.
You can also visit the Circle Store on Amazon for more information about the brand and its products.
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