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Each diver should have a primary light. Do they need to be equal strength? Probably not, but they should each should be bright enough to be considered a primary.
That said, during lobster season, we mainly used what most people would consider back up lights because we wanted our hands free. It worked for us, but I wouldn't recommend it for others.
Really, in a recreational OW environment, it comes down to comfort level. If you're comfortable with seeing less around you, then maybe a primary and a secondary light is good enough for a buddy team. In an overhead environment, definately not.
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