Turbo heads are used to throw the light far away. If you're going to light up a part of the mountain, turbo head is the way to go, after 50 meters, the P91 (which emits 200 lumens) is not very useful already. If you want maximum light with maximum throw, you should look at getting a Surefire 4 cell light, which means either the M4 or the 12PM/12ZM with the old style turbo head or the Steve Ryan turbo head. Add a N62 500 lumens lamp for extreme brightness. But you're limited to 3 mins run time.