The stand-alone mod S.T.A.L.K.E.R. Anomaly aims to be the most stable and customizable experience for fans of the S.T.A.L.K.E.R. games. It's powered by the Monolith 64-bit engine, a custom fork of the X-Ray engine.
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Make it so, the further you are, the weaker the light ( as the light rays would expand out, so the light would be a little weaker)
That's a lot more complex thing to do but it would give more realistic feel.