In Game Lighting With More than 1 Lamp in GLSL

I’m having a problem with in game GLSL lighting. When I use only 1 light with custom curve falloff, sphere value checked, 20 distance and 1.5 energy, I get the lighting I would expect. However, if I duplicate this lamp and move it elsewhere in my map, no matter how far away I put it it still puts ambient light on my model. I just want it to light models within the distance. I can upload a .blend if I need to to clarify. Thanks guys.