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I can see how the eggcrate would hinder your light performance in the corners or sides with the single halide.
From the reading I have done, the eggcrate (in some situations) does a good job at reflecting the otherwise "spilled" light downards and can increase PAR. In other words all of the angular rays of light that would reflect off the water and out of the tank are foced to strike the water at a steeper angle. The steeper angle allows the light to break the surface instead of reflecting off of it. Those certain "situations" would appear to be ones were the reflector is not very efficient at focusing the light onto the desired footprint without a lot of spill, or with a lot of steep shallow angles.
Great job and thanks for the additional reply. I think a lot of people will be looking at this as a good solution for "jumpers" and small single pendant setups!
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