You might consider using fewer lights and make them brighter. I think the bsp b15 wals are brighter by default, if you haven't switched over yet.
One thing you need to be careful of: Yellow = red + green. In straight yellow light, blue players will look almost black, while red players will be lit. You might want to use lights that are a little whiter. It might be a strain to see blue players with the current lighting.
To answer your question: it's still a bit dim. Visible, but dim. I'd make it a bit brighter (by increasing the light emitted -- maybe 1.5x's, not the number of lights).