I'm darkening the water texture as it is to mix better with the sky, but the color of a texture has nothing to do with what kind of light it reflects. Not in Goldsrc, at least.
None of the textures are emitting light. There are no texlights used at all in this map, for that matter.
Light_spot is out of the question for the sky. Models are lit completely wrong with light_spot.
The pillar is also not fullbright. The top of the pillar is lit normally. If you look at the wood trims, you can see how the same thing is happening to the sides there-- the top is darker, and is receiving proper lighting