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oldgrandpajack said:
1: Better cooling for the PCB. Larger surface area and mass, of the body, is available for disapating heat.
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Sorry, but im 100% sure this is and was not the reason. Firstly, one doesn't cool a pcb, but its components. None of these has a thermal bond to the body of the flashlight. Secondly, we are talking about a 1W Luxeon @ ~350mA here, driven by a CR123. In this case heat shouldn't be a problem for a properly designed circuit.