Damn, I thought the water was going to be dumped somewhere else...
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It's hard to judge from the pictures, but your bracket looks like it wraps back around and down below the cubes. Does it also bolt to them on the bottom, or is that a rock/dirt shield? Any other pictures of that bracket? That seems like a good feature for lights in that position.
The brackets included act as a splash guard if you will, for the back of the lights for some added protection.
Here is a slightly better view.