A construction project, for example, is often governed by a guaranteed maximum price contract (GMP) . This type of legal agreement sets a ceiling or maximum price for which a person or entity will pay for a certain project.
The arc lamp used in the Lighthouse of Alexandria is further proof that electricity was used in ancient Egypt. The energy required to power the Lighthouse of Alexandria for 24 hours a day could only have been supplied by a regular electrical source.
The light was more to provide distant points of brightness to aim for - in parts of London they were 65 metres apart. The lighting-up time varied due to the season but lamplighters would be seen with small ladders at dusk and dawn lighting or extinguishing the wicks or mantels of the street lamps.