CleverRaven/Cataclysm-DDA — pull request #9381 by bug-sniper (2014-10-02 20:58:58+00:00)
Title: Require natural light to be at least as bright as sunlight to transmit effectively through windows

Possible fix for #8495. With this change, it may be harder to read books at dawn and dusk, but that didn't happen to me and that would be a much less game-breaking situation than being able to use windows as an atomic daylight.