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Easy fix.
Open the one up you have (small philips head scewdriver needed), find the resistor that feeds the white leds and cut off one leg.
Find the value of the resistor in series with the red led and increase the value, some experimentation may be needed but you'll end up with a red led torch with the brightness you want and longer battery life.
I seem to remember Ponders mentioning that they will still work with just one battery, i.e. removing one (and replacing with a suitable dummy) will dramatically reduce the brightness, negating the need to adjust the resistor value.
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