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I won't say that you need a third light. However, wide-beam lights suck for signaling, and IME light signals are important for buddy communications during night dives. And signaling with a light attached to a camera rig is pretty awkward.When I'm diving with my camera, which has two wide-beam video lights mounted on arms, do I need to bring a third, narrow-beam light as a backup?
If yes, what's the best place to put it? Clip it to the BCD by a lanyard, put it in a BCD pocket, mount it on the camera housing with a cold shoe adapter or a triple clamp?
I'd bring a narrow-beam light and carry it easily available, e.g. clipped to a D-ring or on a lanyard on my wrist. YMMV, of course.