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Lighthouses were initially illuminated using coal fires and tallow candles[1]. Later, oil was used as an illuminant[1]. The type of oil used included sperm, lard, olive, cocoa-nut, and colza[1]. Mineral oil replaced colza in many lighthouses[1].
Additionally, gas was used as a fuel in some lighthouses[1]. Later, crocus burners were used for combining gas and air[1].
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