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I have two extreme exposure backup lights. Assuming the batteries, are 
fresh, what is the expected burn time of these lights? How many hours should 
I expect the bulbs to last?

If I am planning a cave dive in which the time to exit from maximum 
penetration would be longer than the combined burn time of the two backup 
lights, what should I do? Carry more backup lights? Carry an extra primary 
light? Or should I just hope that everyone's primary doesn't go out at 
maximum penetration?

Thanks.

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