Lights compensation works similarly to intensity, but it multiplies after blending (basically an exposure control). Oh yes, the default "lights compensation" is 3. I was going to change it to 1 and even wrote it in the documentation, but at the last minute I went back to 3 because I realized that this could cause confusion like "my lights got weak in this update" ^^'.
That's an interesting observation; I believe it must be due to the mathematical equation of blending, but basically, the lights are "multiplicatively additive" in the scene, so perhaps that explains the behavior.
No problem, thanks for the kindness =]