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Torches, candles and kerosene lamps gave off very low light. The spectrum of fire in open space is very different from the spectrum of the Sun that nature has “forged” the human eye. Most of the radiation falls in the thermal infrared range. Visible light is radiated mainly by carbon particles that are heated by a flame at high temperature. Hobbit book face mask. The spectrum of fire in the visible band only partially covers the yellow and red bands. Working in such lighting was nearly impossible and many medieval factories banned night vision work under artificial light. Because the product quality would be greatly reduced.