Now what is the perfect bushwalking light solution? Well one thing for certain what is "perfect" for some will be "horrible" for others so lets ignore Nirvana and work on the individual's solution rather than aiming for the workers' paradise of the socialistic state.
For me I like a lot of light and not so concerned about weight and cost. If it works well for me then stuff it I will have two tends to be the Ent way. The solution to the ideal light may or may not be held in a local shop. One thing is certain there is a huge difference in quality of design both user interface and the dark deep geek things like voltage regulation along with construction quality. The advent of the LED changed the game so long run times became an option and voltage regulation started to play an increasingly important role.
In the past lights started out bright and got dim as the battery voltage dropped. With earlier LED you could actually damage the light by using Lithium batteries and conversely got lower light levels from rechargeables. With voltage regulation a LED is driven at its most efficient voltage so as the battery voltage drops the electronics kick in and bring up the voltage. Now there is no such thing as a free lunch and this trickery will draw some current so in poor designs you get a bright light for a shorter period of time. Also some regulation systems cause flicker which annoys a few people but goes unnoticed by others.
Battery type is not a huge factor in rechargeable lights performance. Sure you have AA/AAA in lithium, alkaline and NiMh (Nicad have died off) that many are familiar with but they now have L-ion sized equivalents such as the 14500 which is the AA form. In addition you have the super cells like the 18650 that make flame thrower an accruate description for light output.
I am a magpie and love bright shiny things so have collected a range. Similar to some people's love of stoves. As my dear friends say, everyone needs a hobby.
What I like is a throwing light (distance and narrow beam) for occasional spot the marker or find the disappearing toilet use and a floody beam for general use. Also I tend to like to hang my headlamp above the work area rather than around my head. After some thinking and chin wagging I have become the fan of having a main headlamp and a light weight backup rather than carrying spare batteries (but still have not got out of the habit of carrying batteries). Just as an aside has anyone tried changing a multi-battery pack in the darkest of nights. Having a backup does make sense

I am looking at using a main headlamp for mainly fixed use, a small headlamp as backup (sits in my day pack for a peak bagging effort running overtime) and torch to act as "throwing" beam. I can hear the UL converts running for cover but as said perfect for the individual not a socialistic or would be world dictator's view.
Anyway here is photograph of a few (yes, really they are mine for the lover of question marks after that word). I will write a about a few, and yes, it is my view and prejudice it will be. Sorry I have not mastered the art of dividing nor walking on water but another swim dip in a cold lake might just encourage me to find out how
