In reply to SecretSquirrel:
I recently got the Black Diamond Spot :
That has a superbright 1 watt LED bulb with 3 normal LED's as the alternative. Each has three brightness settings (& there's a strobe as well on each). I thinks it's well worth considering (despite it's £35 price tag). On the lower settings the batteries seem to last forever.
Well worth considering. When full on, it's seriously bright.