How do I retrieve the amount of light hitting an object in a scene with light probes?

So I have a scene with baked lighting and light probes. As the player moves around the scene, I would like to vary the intensity of the fake shadow below the player to simulate the effect of moving in and out of shadow (i.e. if the player is standing fully within shadow he wouldn't be casting a second shadow on top of it). This information must obviously exist as Unity uses it to light the object properly, but I don't see any way to access this information myself. Am I missing something?