Probably lamps fueled with oil and perhaps torches made out of bundles of reeds. Both were what the Egyptians used as regular lighting sources. (There's some dispute about which would have been used more.
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The Egyptians also understood some scientific uses of mirrors, redirecting sunlight down into pyramids to provide light for workmen in the dark tombs. One papyrus even relates how a magician replaced a severed head during a seance, apparently using a mirror to create an optical illusion.
No soot has been found in the corridors of the pyramids or the tombs of the kings because these areas were lit using electricity, the documentary adds. Relief carvings could also show that the Egyptians used hand-held torches powered by cable-free sources.
While many theories have been proposed about how they were built, some researchers believe that the pyramids may have been more than just tombs for pharaohs. They may have also been part of a sophisticated power grid that harnessed hydrogen as a fuel and transmitted electricity wirelessly through obelisks.
Tesla believed that the pyramids were more than just tombs for the pharaohs. He believed that they were energy generators, capable of producing free, limitless energy. His theory was based on the fact that the pyramids were made of conductive materials, such as granite and limestone, which could transmit energy.