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MaxaBaker said:
If you are in a rainforest I would imagine that you are looking for flood and that throw is unimportant for you. I am also assuming that you need something that is portable and pretty tough, possibly even water-proof.
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Throw is extremely important, MaxaBaker. Adriano, you will find that a lot of throw is very useful when you're inside the forest so you can spot animals and navigate more easily. The reason of this is the multi-layered structure (both horizontal and vertical) of rainforests. With a flood light, the beam will get "washed off" (scattered is more like it) and it won't be as useful. With a flood light you'll get a lot more shadows and loose the ability to see very far. Having a wall of light is not a very useful, especially if you want to be on the lookout for animals or other features of the forest.
A flood light is still good for close-range navigation, but you will get more out of a light with throw. Lots of throw with decent sidespill would be ideal. Flood will help when you're walking around, but for positive animal ID (and, thus, safety) throw is important.
You're right on the mark on the toughness, waterproofness, and portability side, MaxaBaker. Will it be the rainy season in Cameroon?
Now, there's one big caviat to having a large light. You either need to use rechargeables or lug a lot of batteries. There is simply no way of getting a super bright light with decent runtime. You should inquire about the availability of electricity where you're headed before finalizing your purchase.
As I suggested on a separate thread, a hybrid headlamp is a sound compromise. You get throw from the Incan lamp, flood from the LED's, the right size for portability, and the option of using AA or equivalent rechargeables.
Adriano, if you provide more details of the logistics of your trip I can help you with other better suggestions. I work in the New World tropics and have been to Africa.