Water sucking light out of scene [Solved]

I put water in my scene and it made everything dim.
Clarification: I changed my water from a primitive plane to a primitive cube and the cube version made everything dim.
[Edit: SOLVED: I did not know that my distant light was INSIDE the cube of water, because I made the cube so huge and did not check to see where it really was. The surface of the water in the images are the BOTTOM surface of the cube, not the top.]
[Edit: Further experimentation reveals that using the cube version effectively turns off my distant light in the renders.]
This is iRay.
Is this normal and to be expected? Or is this a glitch?
Am I just going to have to crank up my light when I add water to a scene this way?
Or is my method for adding water the real problem? I’ve never done it before, so I don’t know.
First image: a 5000 meter primitive plane with the Daz Studio water shader applied. 1 distant light from above.
Second image: a 5000 meter primitive cube with same shader and light. I stopped the render early.




Comments
In the Plane one you are looking under the surface but the plane is just acting as a sky and below it is air.
In the Cube one you are looking through water so the light will be darker as it has the water to pass through and not air.
Try turning the Distant Light off and use Sun and Sky only at the defaults, Mid Summer Midday and overhead, and you will get the light coming through the water plane and the cube plane to get an idea of the difference the light coming through the plane makes rather than below it.