I believe research indicates falcon silhouettes have no significant effect in preventing bird collisions with transparent barriers. The only effective way to prevent such collisions is for the barriers to be opaque i.e. impossible to see through at all, whether tinted green (as seems to be the fashion at the moment) or not.
As for an Eagle Owl (or other large species), it's highly unlikely it would in way be perturbed by the flight silhouette of a bird much smaller than itself.
GeoffC
