Lights for disaster victims

[firefly99]

You can not power an LED from a single cell with a dropper resistance. The forward voltage of the LED is greater than the output voltage of any common cell.

Flashlights that use a single cell are readily available but they use a step up or boost converter either in the bulb or built into the flashlight.

Yes, you are correct.

I have been looking for 1D flashlights in the UK for years for emergency lighting, I cannot find them at all, nobody sells them. John.

I cannot find any 1D flashlight locally too. So I built several Joule Thief.

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