According to Comodín at El Blog de Oro, this light would be used to hunt for treasure: if it was a white light, it would signal gold and silver treasure, if it was red, they had to run away, since it was the devil at work.
Según Comodín en El Blog de Oro, esta luz se usaba para cazar tesoros: si era una luz blanca, era señal de un tesoro de oro y plata, si era roja, había que huir, pues era trabajo del diablo.