Hello JacquesBuys,
Have you bought a lamp yet? My experience is that 70% of the time beam distance is limited by moisture in the air, so having a stronger light may only allow you to see more moist particles in the night. For climbing and hiking purposes I have tried hard to think about when you'll need a stronger light than the myo XP. Maybe if you are doing some route-finding up a sheer cliff, when it may be a good thing to stay put for the night anyway...
On a serious note, where there may at times be benefits to having a strong beam with good distance (spotting nocturnal animals etc), IMHO this is usually offset by the penalty of shorter batterylife/increase in weight due to the heavy battery pack.
If you like a lot of light you should also have a look at the Coleman dual fuel lamps, runs of petrol and cast a light that make other campers in the campsite get up for breakfast, but impractical for hiking. For camping it is very economical though.
Let us know when you've made a decision and about your experience.