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“from wikipedia” Early flashlights ran on zinc-carbon batteries, which could not provide a steady electric current and required periodic “rest” to continue functioning.[1] Because these early flashlights also used energy-inefficient carbon-filament bulbs, “resting” occurred at short intervals. Consequently, they could be used only in brief flashes, hence the common North American name “flashlight”
it seems like after 120 years we have pretty much ended up where we have started, a light that can be used for brief flashes lol.