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   A friend of mine asked me about backup lights. I use
two, Oceanic 3 - c battery "hilites".  The trick to backup lights
is no rechageables, use the 3-c battery lights, and make sure that
the voltage of the bulb matches the combined voltage of the 
batteries. Check the batteries - some manufacturers think they
are doing you a facor to pump the voltage up to 1.6 - too much.
If there is not a match, go get new bulbs. If you can't get the 
right
bulb, don;t use the light. Another nice feaure is that they have
an attachment pint at the end of the cannister. If you are using
Princeton Tec lights , for example , change the bulb. If you 
are using those little Q 40's , throw them away. - George

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