"Electricity passed through mercury vapor in a fluorescent lamp produces short-wave ultraviolet light which then causes the phosphor in the tube to fluoresce, making visible light."
..."Compared to other metals, it is a.... fair conductor of electricity.
Not far away, in the Sun Pyramid:
"In 1906, another surprising discovery was made in Teotihuacan as researchers discovered a thick layer of Mica on top of the Pyramid of the Sun."
Mica has the opposit characteristica from Mercury. Used at least up to the 70` as insulater both for Heath and currence.
Pyramid is greek, meaning: Fire-from amid. (Or deslike)
It should be obviuos that Chris Dunn is on the right track when he consider pyramids to be powerplants.