During the recent years we've seen quite a few important changes in this area, probably the most important one being related to the development of flashlights that don't require batteries in order to function properly, Despite of the fact that the main concept behind high power flashlight has remained pretty much unchanged over the years. By a crank-based mechanical system or by simply shaking them, most of them are powered either by the sun (via a built-in photovoltaic cell). Nowadays, flashlights or torches can be divided into two major categories: one designed for normal users, which generate a more or less OK amount of light and are quite battery-efficient, and a second one designed mostly for professionals (law-enforcement agents, the military, etc.), whose features are way above those provided by normal batteries, especially in terms of power. What is more, these special-purpose flashlights are a lot tougher than your average flashlight, their metallic (usual airplane-grade aluminum) body supporting quite a fair share of shocks.
By passing an electric current, this type of light source works through a ball of ionized gas, which glows very brightly. These advanced flashlights use either LEDs for high brightness/low power consumption or High Intensity Discharge (HID) light source. Indeed, it typically generates a much brighter beam than usual flashlights, but in the same time, during normal functioning, which means that the batteries will be depleted a lot faster, it requires more power.
Of course, we're heading towards an age where flashlights won't ever require any additional batteries, being charged by all sorts of external elements, such as the sun, the wind, the movement of one's hand, etc, the future of flashlights is still to be decided, but judging by what we can see today. Of course, lighting technology and optics are also quite probably going to change, so all we can do right now is waiting and seeing.
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