I remember reading an old thread on RC where Calfo stated something about the use of eggcrate actually increasing light penetration if the eggrate was placed within a few inches of the fixture and the thin side was placed facing up (apparently there is a thicker and a narrower side to the eggrate partitions? I've never actually checked.) The minimal light that was blocked was compensated for by the reflectors refocusing the light that passed through.
That being said, if the eggcrate was placed more than 2-3 inches from the fixture, the outcome was negligible.
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