First, I am no engineer but the candle power measurement is very subjective. I believe it is more a measurement of brightness than total light emitted. For example a small amount of total light focused on a small area would yield a high candlepower. There is a good forum on flashlights at???? try http://www.candlepowerforum.com
I am just guessing here, and I am sure someone more knowledgeable in this area will clock in shortly, but as I understand it the lights work like this: There is a housing that holds batteries and then you put a bulb on. The bulb determines the candle power of the light. It also determine the duration of the batteries. The surefire lights usually have optional bulbs, one will last for an hour or more and be regular bright, the other bulb is like sitting in a microwave on the surface of the sun, but then it lasts about 15 minutes. It is possible that the units are the same but the bulbs are different. Good shooting.
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