The eggcrate is in the section with the suspended ceiling tracks and panels. Since that's what it is made for, it makes sense for it to be there. It is used for more than just lighting, it can also be used as a ventilation panels too.
I know my way around HD prety well since I seem to be in there more than some of the people who work there. 
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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