For underwater safety equipment, fluorescent yellow-green is typically the most visible color. This is because:
- Yellow-green light penetrates water more effectively than red or orange
- The human eye is most sensitive to yellow-green wavelengths
- Fluorescent materials enhance visibility by converting UV light into visible light
This is why many diving safety equipment items, such as surface marker buoys and emergency signaling devices, are manufactured in fluorescent yellow-green. For backup visibility, reflective materials are often combined with fluorescent colors to maximize detection probability both during day and night conditions.