LED manufacture has a multi-continental supply chain, which may not always be there when we need it.
Candles and oil lamps have truly rubbish efficiency, but store well and can be DIYed.
Incandescen...
I have to add that candles are useful for some limited heating purposes. Yes i know it sounds odd, but there can be a difference. A candle lantern (like the big from uco for example) can produce up to 5000 btu.
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