--- and controlable
You could increase the light intensity of the lights.rad, but this will also increase the color/light casted into the room from the light textures
Or you could put individual light entities in front of the lights to simulate the glow it should have without increasing the ambient light casted from the textures
As Thaldarin said, light spots are also very powerfull to make your lighting come alive, just make sure you are not going to create a disco lighting theme with these neon lights

(white spots ftw here)
On a sidenote, the 2nd screenshot reminds me of an action half-life map called ahl_endlrainhc. Not the architecture, but the lights and colors used