1. Product Overview
The Flowtron BF-190 UV Replacement Bulb is designed to attract mosquitoes and other flying insects to your Flowtron BK-40D Outdoor Bug Zapper. This 40-watt UV bulb is essential for the effective operation of your bug zapper, ensuring continuous pest control for areas up to one acre.
Regular replacement of the UV bulb maintains optimal performance of your bug zapper, as UV light intensity diminishes over time.

Image: The Flowtron BF-190 UV Replacement Bulb shown alongside the compatible Flowtron BK-40D Outdoor Bug Zapper, highlighting its purpose.
2. Installation and Setup
Replacing the UV bulb in your Flowtron BK-40D Outdoor Bug Zapper is a straightforward process that does not require special tools. Follow these steps carefully to ensure safe and proper installation:
- Disconnect Power: Before beginning any maintenance or installation, always disconnect the bug zapper unit from its electrical power source. Ensure the plug is completely removed from the outlet.
- Remove Plastic Cover: Locate the plastic cover at the base of the bug zapper unit. Depress any latches or clips securing the cover and carefully remove it.
- Remove Old Bulb: Gently pull the old UV bulb straight out from its socket. Avoid twisting or forcing the bulb.
- Insert New Bulb: Align the pins of the new Flowtron BF-190 UV Replacement Bulb with the slots in the upper socket. Carefully push the new bulb into place until it is securely seated.
- Replace Cover: Reattach the plastic bulb cover to the base of the unit, ensuring all latches or clips are securely fastened.
- Reconnect Power: Once the new bulb is installed and the cover is secure, reconnect the bug zapper to its electrical power source.

Image: A visual guide illustrating the five-step process for safely replacing the UV bulb in the bug zapper.

Image: Close-up of a hand inserting the replacement bulb, emphasizing the ease of installation without tools.
3. Operation
Once the Flowtron BF-190 UV Replacement Bulb is correctly installed and the bug zapper unit is reconnected to power, the bulb will illuminate when the zapper is turned on. The UV light emitted by the bulb attracts flying insects to the zapper's electrified grid, where they are eliminated.
4. Maintenance
To ensure continuous and effective insect control, it is recommended to replace the Flowtron BF-190 UV bulb annually, or as needed, depending on usage and visible light output degradation. While the bulb itself requires no cleaning, periodically clean the bug zapper's grid and collection tray according to your bug zapper's specific instructions to maintain optimal performance.
5. Troubleshooting
Bulb Does Not Light Up:
- Check Power Connection: Ensure the bug zapper is securely plugged into a functional electrical outlet.
- Verify Bulb Installation: Confirm that the replacement bulb is fully and correctly seated in its socket. Remove and reinsert if necessary.
- Inspect Bulb for Damage: Although new, inspect the bulb for any visible damage such as cracks or broken pins. If damaged, do not use.
- Check Zapper Unit: If the bulb is correctly installed and undamaged, and the unit still does not power on, there may be an issue with the bug zapper unit itself. Refer to your bug zapper's instruction manual for further troubleshooting.
6. Specifications

Image: The Flowtron BF-190 UV Replacement Bulb displaying its approximate dimensions.
| Feature | Detail |
|---|---|
| Brand | Flowtron |
| Model Number | BF-190 |
| Light Type | Fluorescent (UV) |
| Wattage | 40 Watts |
| Bulb Base | Prong |
| Bulb Shape Size | T (Tubular) |
| Item Weight | 0.25 Pounds |
| Material Type | Copper |
| Compatibility | Flowtron BK-40D Outdoor Bug Zapper |
7. Warranty Information
The Flowtron BF-190 UV Replacement Bulb is sold without a manufacturer's warranty. Please inspect the product upon receipt for any defects or damage.
8. Customer Support
For further assistance or inquiries regarding the Flowtron BF-190 UV Replacement Bulb or compatible Flowtron products, please visit the official Flowtron website or contact their customer service department. Ensure you have your product model number (BF-190) available when seeking support.