techlulu says in an image where they sell lenses such as these state that the recommended distance is 4cm between two of them. I dont know the actual way to use these though yet
s***0 (17)- Feedback left by buyer.
Past month
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Item was shipped fast and worked perfectly
i***0 (9)- Feedback left by buyer.
Past month
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Great. Great. Great.
o***s (265)- Feedback left by buyer.
Past year
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Bleep'n awesome.
l***k (2)- Feedback left by buyer.
Past month
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The diode is as advertised and I am really happy with the price and the shipping time it took.
z***8 (15)- Feedback left by buyer.
Past month
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Chip arrived functional in new condition, well packaged to prevent damage.