Exaggerated caustics in cycles

I am rendering an interior scene, but I’m having problems in the sun that is generating many caustic in wall because of the reflecting floor.

Sun (300 passes):


No sun (300 passes):


Disabling the caustic my scene would be less real.
Replace the sun for a plan with Emmit does not solve my problem.

In a number of cases, the best solution would be to just let the engine render out more samples, the apparent brightness of the caustics will often go down a bit as the samples average out (especially in areas where the fireflies are more isolated)

Give bigger planes with light but with lower value.