Caption: Bell Rock Lighthouse (Angus, eastern coast of Scotland) constructed in 1807--1810 by Robert Stevenson (1772--1850).

Robert Stevenson (1772--1850) was the grandfather of writer Robert Louis Stevenson (1850--1894)---you know, Treasure Island (1883).

The two lighthouse light beams going in opposite directions have a relative velocity of nearly 2c (i.e., twice the vacuum light speed c = 2.99792458*10**8 m/s (exact by definition) ≅ 3*10**8 m/s = 3*10**5 km/s ≅ 1 ft/ns) as observed in the lighthouse inertial frame.

But this is just a geometrical velocity.

NO information (including energy) is sent faster than c relative to a local inertial frame including those local inertial frames set up using inertial forces.

The two light beam can only convey information from where they started at the lighthouse.

By the by, yours truly's father was briefly a lighthouse keeper in the 1950s (or so) at the Port Colborne Lighthouse in Port Colborne, Ontario, Canada---my hometown.

Credit/Permission: Miss Stevenson (fl. 1850?) (daughter of Robert Stevenson) in Alan Stevenson's (1807--1865) Biographical Sketch of the Late Robert Stevenson, 1861 (uploaded to Wikipedia by User:Tagishsimon, 2006) / Public domain.
Image link: Wikipedia: File:Bell Rock Lighthouse - Google Book Search - Biographical Sketch of the Late Robert Stevenson.jpg.
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