Also typical of Pleasonton's business dealings was his relationship with Winslow Lewis. Lewis, a sometime engineer and inventor, had developed a new lighting system for use in American lighthouses. Pleasonton immediately agreed to its use, primarily because he viewed it as cost-effective. The system had its detractors, however, including the brothers Blunt, publishers of the American Coast Pilot; they received many irate letters from various mariners, which they forwarded to Pleasonton. Furthermore, although Augustin Fresnel had developed his revolutionary system of lenses in 1820, Pleasonton refused to sanction their use, viewing them as too expensive. He preferred to remain with Lewis' system, claiming that it was adequate for lighting the American coast.

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