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Yes one side of the eggcrate is "thick" and the other "thin". If you look at metal diffusers the same is true. Very little information is available about these things... some people asy that the "wedge" shaped grid runners are top help it pop out of the injection mold. However, a study of high tech light panels will show that it is a design parameter.
From my understanding FAT side towards the light causes the light reflected off the water to be bounced back off of the grid, while still allowing light to penetrate from above, as well as guiding the shallow angled light. THIN towards the light causes a more of the light to be lost and less to be reflected back to the water from underneath. If anybody has any hard studies or data on this it would be great. We may want to move it to another thread in fairness to the OP.
Bean
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