Curious how many NU25 lamps you can carry for the weight of a triple A headlamp and batteries to keep it running the same amount of time.

My use of the NU25 has been very seldom ever needing to run on high. I use it generally only if I haven't seen a clear trail marking at an intersection. I understand that for those who need it to run longer on high might want something different. I do own their NU30, heavier brighter and a believe the battery size is tripled.