The best LED flashlight/headlamp I've found for boating at night is the
Photon Freedom Fusion. Click the link and scroll down for full information. Notably:
- Red as primary or secondary color
- Full range dimmer
- AA (not AAA) batteries
- Safety beacon modes
- Water resistant
- Rugged
- Headlamp or flashlight
- Constant brightness
UPDATE: I've now learned that red color doesn't really preserve night vision -- what matters is (low) light intensity, not color (see
Night Vision, The Red Myth), but the Photon Freedom Fusion (White) is still a good choice, because it's fully dimmable.
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