Lighting Problem - Lights Sharing 3-D Space?

It may because I’ve been awake for too long but I am not understanding why this is happening. Should there be any reason? Here is a snapshot of my short scene:

a ground that’s 100 meters long with a small cylinder about 100 meters long as well. 3 point lights down the center. The one in the middle is fine but if I adjust the intensity of EITHER light on the ends, the opposite one’s intensity goes away.

As in, if I make one at the far end brighter, the closer one goes away - vice versa. What’s the dealio?

The problem is that every light have to be calculated in the shader. I don’t know exactly how many lights per object are supported but Unity will always pick the brightest lights that affects the object. There’s also a limit set in your quality settings how many pixel lights you want to use.

http://forum.unity3d.com/threads/823-Dim-Lights-and-Light-Count