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The materials white0## are used to create 'texlight', textures that emit light in games. They are located in the HL2 folder:
- hl2 \ materials \ Lights
The only differences between each white0## material is they become more blueish the greater the 000 number is (001-010). It's recommended to match the color of your texture with the light emitted defined in light.rad, unless you are looking for an effect, like a red wall that emits blue light.
To customize the colors emitted by the white0## materials, you can locate them in the light.rad of HL2.
lights/white001 250 240 205 100 lights/white002 189 233 247 425 lights/white003 232 246 190 350 lights/white004 170 228 247 425 lights/white005 234 235 220 375 lights/white006 234 235 220 100