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From The Vault - Fallout Wiki
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Simu-Sun is a technology used in Vaults to simulate the effect of the sun. According to a Vault-Tec advert, Simu-Sun reproduces the feeling of being outside, with only a fraction of the sunburn potential.

It was one of the technologies on display at the Vault-Tec demonstration exhibit at the Museum of Technology in Washington, D.C. when the Great War began.