Info texlights (GoldSource Engine)
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It works similarly to a lights.rad file by allowing textures to emit light. Texture lights are defined through its key values, where the key is the name of the texture to emit light from, and the value is the color and intensity of the light. For example, a keyvalue pair with the key
LIGHT1 and the value
255 0 0 200 would make the texture LIGHT1 emit a red light.