Introduction
Thank you for choosing the DARKBEAM B16 365nm UV Flashlight. This powerful and versatile blacklight is designed for a wide range of applications, including pet urine detection, resin curing, money and leak detection, and identifying fluorescent agents. Its compact design and robust construction make it an essential tool for both professional and home use. This manual provides detailed instructions for safe operation, setup, maintenance, and troubleshooting to ensure optimal performance and longevity of your device.

Image: The DARKBEAM B16 365nm UV Flashlight, showing its compact size, the three UV LEDs, the power button, and the included yellow UV glasses and USB-C charging cable.
Important Safety Information
Please read and understand all safety warnings before using this product. Failure to follow these instructions may result in injury or damage to the device.
- Eye Protection: Do not directly point the UV light at your eyes or the eyes of pets or other individuals. Prolonged exposure to UV light can cause eye damage. Always use the provided protective eyewear when operating the flashlight.
- Skin Exposure: Avoid prolonged direct exposure of skin to UV light.
- Children: Keep the device out of reach of children. This is not a toy.
- Battery Safety: Use only the specified battery type. Do not attempt to disassemble, crush, or expose the battery to extreme temperatures or fire.
- Charging: Use only compatible 5V 2A USB-C charging adapters. Do not charge the device unattended.
- Disposal: Dispose of the battery and device according to local regulations. Do not dispose of in household waste.
What's in the Box
Verify that all components are present upon unboxing:
- DARKBEAM B16 365nm UV Flashlight
- UV Glasses
- USB-C Charging Cable
- Lanyard
- 1 Lithium Ion battery (pre-installed)
Key Features
- Powerful 365nm UV Light: Equipped with 3 high-intensity LEDs, providing 20W of pure 365nm ultraviolet light, ideal for professional detection needs.
- Professional Filtering: Features a hard tempered black filter optical lens that blocks disturbing visible light, ensuring a purer, invisible UV365 light output for more pronounced detection effects.
- USB-C Rechargeable: Built-in high-capacity battery with a hidden USB-C charging port allows for convenient and fast charging from various 5V 2A sources.
- Long-Lasting Performance: Provides up to 5 hours of high-intensity illumination on a single charge.
- Compact & Portable: Mini pocket-sized design (4.68"H x 1.18"W x 1.02"D, 2.65 oz) with an included lanyard for easy one-handed operation and portability.
- Durable Construction: Made from military-grade aluminum alloy, offering drop-resistance, wear-resistance, and protection against scratches and corrosion.
- IPX4 Water-Resistant: Features a thickened rubber seal, allowing it to withstand rain or snow without concerns.
- Battery Indicator: A power indicator light on the side switch turns red when the battery is low, reminding you to recharge.

Image: Illustration of the black UV filter lens, demonstrating how it filters out visible light to emit a purer 365nm UV wavelength for enhanced detection.

Image: The flashlight is shown resisting water splashes and being driven over by a tire, highlighting its IPX4 water-resistant and virtually indestructible design.
Setup
Charging the Device
Before first use, fully charge your DARKBEAM UV Flashlight. The device comes with a pre-installed lithium-ion battery.
- Locate the hidden USB-C charging port on the flashlight.
- Connect the provided USB-C cable to the flashlight's port.
- Connect the other end of the USB-C cable to a 5V 2A power source, such as a wall adapter, power bank, or laptop USB port.
- The power indicator light on the side switch will turn red while charging.
- Once fully charged, the indicator light will turn green. Disconnect the charging cable.
A full charge provides up to 5 hours of high-intensity light illumination.

Image: Visual guide to the Type-C charging feature, illustrating the charging port, compatible power sources, battery life, and the charging indicator lights.
Operating Instructions
General Operation
- To turn the flashlight ON, press the power button located on the side of the flashlight.
- To turn the flashlight OFF, press the power button again.
- Always wear the provided UV glasses when using the flashlight for detection purposes to protect your eyes.
Specific Applications
The DARKBEAM B16 365nm UV Flashlight is highly effective for various detection tasks:
- Pet Urine Detection: Shine the UV light in dimly lit areas to reveal dried pet urine stains, which will fluoresce under the 365nm UV light.
- Resin Curing: Accelerate the curing process of UV-reactive adhesives and resins.
- Money and Document Verification: Identify security features on banknotes, passports, and other official documents that fluoresce under UV light.
- AC System Leak Detection: Detect leaks in AC systems by illuminating areas treated with UV dye.
- Scorpion Detection: Scorpions are known to fluoresce brightly under 365nm UV light, making them easy to spot in dark environments.
- Mineral and Gemstone Identification: Observe the fluorescence of certain minerals and gemstones to aid in identification.
- Hotel Room and Home Inspection: Use to check for cleanliness and hidden stains in hotel rooms, bathrooms, and other areas.
- Fluorescent Parties: Enhance the glow of fluorescent paints and materials.

Image: A visual demonstration of the flashlight's effectiveness in revealing hidden pet stains on a cat's fur, contrasting normal view with UV light view.

Image: The flashlight illuminates a bathroom, making invisible stains on the toilet and floor visible, demonstrating its utility for sanitary inspection.

Image: A collage showcasing diverse uses, including mineral and antique inspection, feline ringworm detection, leak detection, banknote authentication, pet urine and stain identification, and fluorescent agent visibility.
Maintenance
Proper maintenance ensures the longevity and optimal performance of your UV flashlight.
- Cleaning: Wipe the flashlight body with a soft, damp cloth. Do not use abrasive cleaners or solvents. Ensure the lens is clean for clear light output.
- Storage: Store the flashlight in a cool, dry place away from direct sunlight and extreme temperatures. If storing for extended periods, ensure the battery is partially charged (around 50%) and recharge every few months to prevent deep discharge.
- Water Resistance: While IPX4 water-resistant, avoid submerging the flashlight in water. Ensure the USB-C port cover is securely closed when not charging to maintain water resistance.
- Battery Care: Do not overcharge or completely drain the battery. The built-in protection circuit helps manage this, but good charging habits extend battery life.
Troubleshooting
If you encounter issues with your DARKBEAM UV Flashlight, refer to the following common problems and solutions:
- Flashlight does not turn on:
- Check if the battery is charged. Connect the flashlight to a power source using the USB-C cable. The indicator light should turn red.
- Ensure the battery is correctly inserted (if removable, though this model has an included battery).
- If the battery indicator is red and the flashlight still doesn't turn on after charging, the battery may need replacement or there could be an internal issue.
- Light is dim or flickers:
- The battery level is likely low. Recharge the flashlight immediately. The power indicator light will turn red when low.
- Ensure the lens is clean and free of smudges or debris.
- Charging is not working:
- Verify that the USB-C cable is securely connected to both the flashlight and the power source.
- Try a different USB-C cable or power adapter to rule out faulty accessories.
- Ensure the power source provides 5V 2A output.
If these steps do not resolve the issue, please contact customer support for further assistance.
Specifications
| Feature | Specification |
|---|---|
| Model Number | B16-DB-365NM-01 |
| Light Source Type | UV (365nm) |
| Number of LEDs | 3 |
| Light Source Wattage | 20 Watts |
| Power Source | Battery Powered |
| Battery Type | 1 Lithium Ion (included) |
| Voltage | 3.7 Volts |
| Product Dimensions (D x W x H) | 1.02"D x 1.18"W x 4.68"H |
| Item Weight | 2.65 Ounces |
| Material | Aluminum |
| Water Resistance Level | IPX4 (Waterproof) |
| Color | UV Light 365nm (Violet) |
| Special Features | 3D print, UV resin curing, Scorpions, Stains, Pet urine detection, Uranium glass, Invisible ink |
Warranty and Support
DARKBEAM provides a 180-day warranty for the B16 365nm UV Flashlight, covering manufacturing defects and performance issues.
For any questions, concerns, or technical support, please contact DARKBEAM customer service. We are committed to providing 24/7 online support and ensuring a great shopping experience. If you encounter any issues with your UV torch, please feel free to contact us via email through your Amazon order details.
We are ready to assist you and ensure your satisfaction.





