The best time to use a UV flashlight for rock hunting is at night. Here's why:

1. **Enhanced Visibility of Fluorescent Minerals**: Many minerals and rocks contain fluorescent properties that cause them to glow under UV light. At night, the absence of natural light makes these fluorescent minerals stand out more clearly against the dark background.

2. **Reduced Visual Distractions**: Nighttime hunting minimizes visual distractions from natural light, allowing you to focus more effectively on the glowing minerals. This can significantly improve your ability to spot and identify fluorescent rocks.

3. **Practical Considerations**: 
   - Bring a regular flashlight in addition to your UV flashlight for general illumination and safety, especially when navigating uneven terrain.
   - Test your UV flashlight before heading out to ensure it's working properly.
   - Familiarize yourself with the hunting area during daylight hours if possible, to avoid potential hazards at night.

4. **Equipment Recommendations**: 
   - A 365nm UV flashlight is generally recommended for rock hunting as it provides deeper penetration and better fluorescence for many minerals.
   - Consider a rechargeable UV flashlight for longer hunting sessions and convenience.

By using your UV flashlight at night, you can take full advantage of the fluorescent properties of many minerals, making your rock hunting expeditions more productive and rewarding.

LEARN MORE:UV FLASHLIGHT FOR ROCK