If you are going to be out at night navigating then you are going to need a Head Torch. I always have 2 in my bag.

Petzel MYO RPX

My main torch is the Petzel MYO RPX. This is an expensive torch (about £60) but very powerful with an additional boost button. It does, however, really drain batteries fast so I usually carry spare batteries for it too.

Alpkit Gamma

My back up torch is the Alpkit Gamma. This is a bargain at £18. It has 4 different LED's (green, red, a big white and a small white). The red and green lights are for using on moonlit nights when you do not need the torch to walk by. When you need to look at the map using the red or green LED's will not destroy your night vision.

It also has a red light on the battery pack which I assume is for runners and cyclists. However, one of my friends has one of these torches and when he gallops off down the hill in the dark at the end of the day it is nice to see roughly where he is and which way I'm going to be heading.