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tokens: This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under grant No. DGE 1144083 and the National Science Foundation under grant No. 1616538. The National Solar Observatory is operated by the Association of Universities for Research in Astronomy under a cooperative agreement with the National Science Foundation. This work utilized the Janus supercomputer, which is supported by the National Science Foundation (award number CNS-0821794) and the University of Colorado Boulder. The Janus supercomputer is a joint effort of the University of Colorado Boulder, the University of Colorado Denver and the National Center for Atmospheric Research. The authors are grateful for the International Space Science Institute in Bern for hosting the International Team 335 “Toward New Models of Solar Spectral Irradiance Based on 3D MHD Simulations,” which resulted in fruitful discussions. The authors thank Matthias Rempel for providing the MHD snapshot, and both Han Uitenbroek and the referee for useful feedback to improve the quality of the work.