I bought a quart of the white. I HOPE it might make the whites look brighter to a bird. But who really knows? Shinning a uv light on something is not the same as what birds might see.
I figure I will use it when I am painting white anyway, but not go through the trouble of repainting everything.
If it increases my success even 2% that is good enough for me. But if they did had even one scientific study that backed it up wouldn't it be in their ads?