STALKER Clear Sky
This mod makes the artifacts slightly somewhat better. Recommended to play on Veteran or higher, or it will make the game too easy.
Multiple mod pack with options to remove night, add sunshafts to most weather, and change the frequency weather types occur.
This is a simple fix for the glitch you get if you do Yar's night-only quest before turning in any flash drives, DOES NOT REQUIRE A NEW GAME, it IS simple, but it's also mine, if you use it in a compilation, please give credit!