1. Product Overview
The YOUKE Lighting G9 LED Bulb is an energy-efficient and long-lasting replacement for traditional 25W G9 halogen bulbs. Designed for various indoor lighting applications, these 3W LED bulbs provide 250 lumens of warm white light at 3000K, offering a comfortable and consistent illumination.
Key Features:
- Energy Efficient: 3W LED replaces 25W halogen, saving over 90% on electricity bills.
- Long Lifespan: Average bulb life of 20,000 hours, lasting 10 times longer than halogen bulbs.
- Warm White Light: 3000K color temperature for a comfortable ambiance.
- High Color Rendering: Standard Ra 80 ensures accurate color representation.
- Non-Flickering: Provides uniform lighting without visible flicker.
- Cooler Operation: Generates significantly less heat than halogen bulbs.

Figure 1.1: A pack of six YOUKE Lighting G9 LED Bulbs, showcasing their compact design and G9 bi-pin base.
2. Specifications
Refer to the table below for detailed technical specifications of the YOUKE Lighting G9 LED Bulb.
| Attribute | Value |
|---|---|
| Brand | JAUHOFOGEI |
| Model Number | YU9646WW2 |
| Light Type | LED |
| Wattage | 3 Watts |
| Incandescent Equivalent | 25 Watts |
| Bulb Base | G9 |
| Bulb Shape Size | T4 |
| Voltage | 120 Volts AC |
| Light Color | Warm White |
| Color Temperature | 3000 Kelvin |
| Brightness | 250 Lumens |
| Color Rendering Index (CRI) | 80 |
| Average Life | 20,000 Hours |
| Material | Copper (internal components) |
| Indoor/Outdoor Usage | Indoor use only |
| Item Weight | 2.08 ounces (per pack) |
3. Safety Information
Please read and understand all safety precautions before installing or operating the G9 LED bulbs. Failure to follow these instructions may result in electric shock, fire, or personal injury.
- Power Off: Always turn off the power to the fixture at the circuit breaker or fuse box before installing or removing bulbs.
- Indoor Use Only: These bulbs are designed for indoor applications only. Do not use them in outdoor or wet locations.
- Voltage Compatibility: Ensure the fixture's voltage (120V AC) matches the bulb's voltage.
- Fixture Compatibility: The bulb size is longer than some traditional G9 halogen bulbs. Verify that the bulb will fit completely within your fixture before purchase and installation.
- Non-Dimmable: These bulbs are non-dimmable. Do not use them with dimmer switches, as this may cause damage to the bulb or the dimmer.
- Handle with Care: Although LEDs are cooler than halogens, allow bulbs to cool before handling if they have been in operation.
- Proper Disposal: Dispose of old bulbs according to local regulations.
4. Setup & Installation
Installing the YOUKE Lighting G9 LED Bulb is a straightforward process. Follow these steps carefully:
- Prepare the Fixture: Ensure the power to the light fixture is turned off at the main circuit breaker.
- Remove Old Bulb: Carefully remove the existing G9 bulb from the fixture. Allow it to cool if it was recently in use.
- Check Dimensions: Before inserting, compare the dimensions of the new LED bulb with the old bulb and the fixture's space to ensure a proper fit. The G9 LED bulb is 49mm (1.93 inches) long, while a typical G9 halogen bulb is 41mm (1.6 inches) long.
- Insert New Bulb: Align the two pins of the G9 LED bulb with the sockets in the fixture. Gently push the bulb straight into the socket until it is securely seated. Do not force the bulb.
- Restore Power: Once the bulb is securely installed, restore power to the fixture at the circuit breaker.
- Test: Turn on the light switch to confirm the bulb is working correctly.

Figure 4.1: Dimensional comparison between a standard G9 halogen bulb and the YOUKE Lighting G9 LED bulb. Note the LED bulb's slightly longer length.
5. Operating Instructions
Operating the YOUKE Lighting G9 LED Bulb is simple and requires no special procedures beyond standard light bulb usage.
- Power On/Off: Use the standard wall switch or fixture switch to turn the light on or off.
- Instant On: The LED bulb provides instant full brightness upon activation, with no warm-up time.
- Non-Dimmable: As stated in the safety information, these bulbs are not designed for use with dimmer switches. Attempting to dim them may lead to erratic behavior or damage.

Figure 5.1: An example of the warm white light output provided by the G9 LED bulbs in a typical room environment, demonstrating their illumination quality.
6. Maintenance
The YOUKE Lighting G9 LED Bulbs are designed for minimal maintenance due to their long lifespan and durable construction.
- Cleaning: If cleaning is necessary, ensure the power is off and the bulb is cool. Gently wipe the bulb with a soft, dry cloth. Do not use liquid cleaners or abrasive materials.
- Replacement: With an average lifespan of 20,000 hours, frequent replacement is not expected. Replace the bulb only when it reaches the end of its operational life.
- Storage: If storing unused bulbs, keep them in their original packaging in a cool, dry place to protect them from damage.
7. Troubleshooting
If you encounter issues with your G9 LED bulbs, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Bulb does not light up | No power to fixture; Bulb not seated correctly; Defective bulb | Check circuit breaker/switch; Re-seat bulb firmly; Test with another known-good bulb; Replace if defective. |
| Bulb flickers or blinks | Used with a dimmer switch; Loose connection; Incompatible fixture | Ensure bulb is not connected to a dimmer; Check bulb seating; Verify fixture compatibility. |
| Bulb is dim or not bright enough | Incorrect wattage replacement; Voltage issue | Confirm the bulb's lumen output meets your needs; Check fixture voltage. |
| Bulb burns out quickly | Over-voltage; Poor ventilation in fixture; Defective bulb | Ensure fixture voltage is 120V AC; Ensure adequate airflow around bulb; Replace defective bulb. |
| Bulb does not fit in fixture | Bulb dimensions are too large for fixture | Verify fixture's internal dimensions before purchase. This bulb is slightly longer than some halogens. |
8. Warranty and Support
The YOUKE Lighting G9 LED Bulbs come with a 1-Year Warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use.
Warranty Exclusions:
- Damage caused by improper installation or misuse.
- Damage from unauthorized repairs or modifications.
- Damage due to acts of nature or accidents.
- Use with incompatible dimmer switches.
Customer Support:
For warranty claims, technical assistance, or any questions regarding your YOUKE Lighting G9 LED Bulbs, please contact the seller or manufacturer through the platform where the product was purchased. Please have your purchase details and model number (YU9646WW2) ready when contacting support.