Limiting the Glow Effect with alpha

I saw a whole lot of stuff on how to limit the glow effect to only certain objects by changing its alpha, but no one tells me how to change the alpha. So it would make sense that the alpha is the A in the color changer on the material, but after turning it to 0 I still see just as much glow as I did with it at 255.

Er, does anyone know how I can limit the glow effect to only certain objects with alpha?