SmartMatrix - Dynamic LED Art Display: Hi, I'm Louis, and I designed the hardware on the open source SmartMatrix Display. This instructable shows how I built the first prototype for SmartMatrix that has all the functionality of the SmartMatrix...

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I’ve not used ninja flex but with standard 3d printed abs I have found that plain white diffuses better and lets almost all the light through. It works well. An as Marc said, a little distance makes a huge difference.

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http://www.ebay.com/itm/Aluminum-LED-Strip-Fixture-Channel-1-Meter-Under-Counter-Cabinet-Light-Kit-/251282818559?pt=LH_DefaultDomain_0&var=&hash=item3a819f85ff

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I second taps plastic. They have some beautiful and extremely reasonably priced acrylics, with a really interesting diffusive coating.

what is the best way to diffuse leds? if i was going to make an enclosure out of ninjaplex, would i use semi transparent? or white? or would it be best to cover leds with white, then use semi transparent as the enclosure? I see lots of led poi use semi transparent, but almost everything i see on here uses white covers.How do you guys diffuse your light in close quarters?

I’m working on a new matrix project and have been trying out these two types of acrylic: http://www.ebay.co.uk/itm/160472892812 http://www.ebay.co.uk/itm/400248891316 The Opal version can be placed quite close to the LEDs without spotting but does reduce the light output a bit more then the plain frosted. I did try sanding plain acrylic but found it difficult to get a consistent result. For frosted 43mm and opal 15mm.

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You can use a variety of different things to diffuse. Experiment! The more important factor is to get a bit of distance between the LEDs and your diffusing material so it’s not sitting right on top of the LEDs. Even 15mm or 30mm will make a big difference from 2 or 3mm.

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I’ve been searching for something on this as well. Tap Plastics carry alot of different acrylic rods I’ve thought of using. They make a half round rod that would work great I think, if you placed the strip in a aluminum channel. Course they also sell acrylic tubes that could be sliced in half.

http://www.aliexpress.com/af/category/200002293/3.html?spm=2114.30010108.4.310.H5ZsRW&g=y&CatId=200002293&shipCountry=us&isAffiliate=y

With either, you would wet sand the inside of the acrylic with 400~600 grit wet sand paper, until you reach the glaze you want for defusing.