Light from Heat

Although they are not (at present) ultralight, I really like the concepts behind these wonderful lamps. Lumir-k: Cooking oil fueled LED lamp:  & Lumir-C Candle Powered Led lamp:

Lumir C:

Lumir K:

This is a similar concept, power from heat: https://drop.com/buy/biolite-campstove-bundle#overview & this: https://www.theultralighthiker.com/2015/07/20/power-from-heat/

PS: You should be able to make this system work with a Peltier on a chimney as in: https://www.theultralighthiker.com/2019/05/29/tim-tinker/

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