These files expand every light source by 10% for every map. While it doesn't increase the brightness of the game, the light sources cover more surface area and better illuminate most dark places. If there's no light source in the map, it's still going to be dark, but the reach that each light has will be 10% wider.
If 10% isn't enough and you want the radius of light sources to be increased by 50%, you can download tushkano's version here:
light-expansion-generated-files
If you want a custom radius percentage you can download the program here and render each map yourself:
doom-3-light-expansion
If you run the program yourself, keep in mind that Doom 3 will take about an hour and a half to render due to the amount of light sources and maps, Resurrection of Evil will take about thirty minutes, and The Lost Mission will take about twenty minutes.
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INSTALLATION
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* IF PLAYING DOOM 3 *
-Place z_10percent_light_expansion_d3.pk4 in Doom 3 base folder
* IF PLAYING RESURRECTION OF EVIL *
-Place z_10percent_light_expansion_d3xp.pk4 in d3xp folder
* IF PLAYING THE LOST MISSION *
-Place z_10percent_light_expansion_d3le.pk4 in d3le folder
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CREDITS
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Alexander Smetkin (Saber Interactive. Senior rendering programmer)
tushkano (reuploader)