I agree that a bit more info would be handy.
I'd like to jump on the CMF Infinity Ultra bandwagon. 1AA, bombproof, enough light for a lot of tasks, killer runtime (listed as 25hrs, CPF tests show about 17 w/lithium batteries). 2.5oz w/batteries (less with lithiums - 2.15oz est.).
The other light I would recommend is the UK 2L. It takes 2 123A cells, fairly bright, light, small, bombproof, waterproof. 2.7oz w/batteries. Runtime listed as 3-4 hrs.
While it would be nice to keep the same types of batteries I think that these two lights are so good at what they do they I think you will end up going backwards trying to compensate. For example, assuming you use lithium batteries for the Ultra (recommended for wt savings), you'll get something like 17 hrs burn time. One or two spares is all you'll need. The UK 2L gets a couple of hours on two cells. One or two battery changes for these lights is almost nothing.
So, for those two lights with batteries: 4.85oz.
One set of spares: 1.68oz (6.53 total)
Two sets of spares: 3.36oz (8.16 total)
To compare, the PT 40 is 5.1 oz, or 3.7 oz with lithiums
Add the Ultra (with lithiums) and you are at 5.85 oz.
Add one set of spares - 2.5 oz or 8.35 oz total.
Add two sets of spares - now you are up to 10.85 oz total.
In both cases runtime is similar, and the PT (and spares) are more bulky.
The other thing to consider is a headlamp. I would say a headlamp is highly desirable if you are climbing or moving at night.
My pet (sight unseen) light is the PT Yukon. 3LEDs, and one Xenon bulb in a small, compact housing. Uses 3AA cells which should give really good runtime with the LEDs, and pretty good brightness with the Xenon. The AA cells are much better than the AAA due to runtime, and the availability of lithium batteries IMO. This headlamp isn't quite available it seems, but should be showing up any time now.
The Petzl Duo has a dual light capability and is available now, but I don't really care for it for a number of reasons.
There are a couple 3LED/3AAA lights out there which are pretty good for many tasks and also small and lightweight. The only downside IMO is that they 1) use AAAs (no lithiums, so heavier in a runtime/weight ratio) and 2) sometimes you want more than 3LEDs.
The Princeton Tech Aurora is a common example of this type. The Aurora is a pretty good one since it is 1) fairly waterproof (unlike some others) and 2) has various brightness modes to save on batteries (only mildly helpful IMO) and can be tilted up and down (it helps when you are in weird positions, trust me!). The only real downside to this light is that it isn't quite as comfortable to wear as, say, the Petzl Tikka (although not bad).
The other common one is the Petzl Tikka. In a lot of ways, I like the Tikka better than the Aurora, but in the end there is no denying it isn't as good of a light (IMO). It's biggest problem is that it has no waterproofing. This is the kiss of death IMO. Shame on them. On the upside, it has a simple on-off switch, which I actually prefer. No goofing around with modes. The other good thing is that it is more comfortable. It doesn't have the up-down adjustment which at first didn't seem like it was needed, but later turned out to be a useful feature.
-john
AA lithium .5 oz
AA alkaline .85 oz
123A lithium .59 oz
AAA Duracell Ultra .4 oz
I'd like to jump on the CMF Infinity Ultra bandwagon. 1AA, bombproof, enough light for a lot of tasks, killer runtime (listed as 25hrs, CPF tests show about 17 w/lithium batteries). 2.5oz w/batteries (less with lithiums - 2.15oz est.).
The other light I would recommend is the UK 2L. It takes 2 123A cells, fairly bright, light, small, bombproof, waterproof. 2.7oz w/batteries. Runtime listed as 3-4 hrs.
While it would be nice to keep the same types of batteries I think that these two lights are so good at what they do they I think you will end up going backwards trying to compensate. For example, assuming you use lithium batteries for the Ultra (recommended for wt savings), you'll get something like 17 hrs burn time. One or two spares is all you'll need. The UK 2L gets a couple of hours on two cells. One or two battery changes for these lights is almost nothing.
So, for those two lights with batteries: 4.85oz.
One set of spares: 1.68oz (6.53 total)
Two sets of spares: 3.36oz (8.16 total)
To compare, the PT 40 is 5.1 oz, or 3.7 oz with lithiums
Add the Ultra (with lithiums) and you are at 5.85 oz.
Add one set of spares - 2.5 oz or 8.35 oz total.
Add two sets of spares - now you are up to 10.85 oz total.
In both cases runtime is similar, and the PT (and spares) are more bulky.
The other thing to consider is a headlamp. I would say a headlamp is highly desirable if you are climbing or moving at night.
My pet (sight unseen) light is the PT Yukon. 3LEDs, and one Xenon bulb in a small, compact housing. Uses 3AA cells which should give really good runtime with the LEDs, and pretty good brightness with the Xenon. The AA cells are much better than the AAA due to runtime, and the availability of lithium batteries IMO. This headlamp isn't quite available it seems, but should be showing up any time now.
The Petzl Duo has a dual light capability and is available now, but I don't really care for it for a number of reasons.
There are a couple 3LED/3AAA lights out there which are pretty good for many tasks and also small and lightweight. The only downside IMO is that they 1) use AAAs (no lithiums, so heavier in a runtime/weight ratio) and 2) sometimes you want more than 3LEDs.
The Princeton Tech Aurora is a common example of this type. The Aurora is a pretty good one since it is 1) fairly waterproof (unlike some others) and 2) has various brightness modes to save on batteries (only mildly helpful IMO) and can be tilted up and down (it helps when you are in weird positions, trust me!). The only real downside to this light is that it isn't quite as comfortable to wear as, say, the Petzl Tikka (although not bad).
The other common one is the Petzl Tikka. In a lot of ways, I like the Tikka better than the Aurora, but in the end there is no denying it isn't as good of a light (IMO). It's biggest problem is that it has no waterproofing. This is the kiss of death IMO. Shame on them. On the upside, it has a simple on-off switch, which I actually prefer. No goofing around with modes. The other good thing is that it is more comfortable. It doesn't have the up-down adjustment which at first didn't seem like it was needed, but later turned out to be a useful feature.
-john
AA lithium .5 oz
AA alkaline .85 oz
123A lithium .59 oz
AAA Duracell Ultra .4 oz