How do I calculate runtime for TerraLUX TLE-300M using 4 D alkalines?

Photongun

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May 4, 2006
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Sydney, Australia
I'm sure there's a plethora of you out there, but can someone please walk me though how one calculates (equation wise) the expected runtime of a TerraLUX TLE-300M using 4 plain old alkalines. Also is it possible for me to use 4 D 12000mah nimh's with theTLE-300Mor will the voltage be too low?

Assistance would be greatly appreciated.
 
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