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The problem is probably that your frosted surface is too close to the LEDs. It needs to be far enough away, compared to the distance between the LEDs, that a point mid-way between two of them gets almost as much light as a point right in front of one. I would guess that it will start to look the way you want when the frosting-to-LED distance is about twice ...


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Looking at microscope and laboratory optics, I think a ground glass optical diffuser was be used, instead of frosted glass. Typically small size however, and expensive. I believe the idea is that random reflections happen inside the thickness of the diffuser, not just at the surface. For overhead lighting, I suspect there are similar things in cheaper ...


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you can take a piece of sandpaper and rub the top of each diode with it to make it rough. Try this on one diode in the array to see if it is good enough to do the trick before you rub all the diodes.


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