If you are electronically minded, there's an even better solution using a 555 timer and a couple of components from JAYCAR - make the LED blink ON for 0.1 sec, then OFF for 0.5 sec.
The longer dark space lets you see faint things without being blinded, 0.1 sec means it can blip quite brightly without affecting your dark adaption.
Much better IMHO than simply dimming it.
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