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I bought a few 1,3 and 5 Watts 400-410nm LEDs from AliExpress shops and I wanted to confirm and/or select the correct 405nm wavelengths out of these for a 70-100 Watts panel.
For this purpose I designed a small FDM-printable spectroscope.
Details and models can be found here: https://www.thingiverse.com/thing:3351995
Maybe this is something of use for others here as well.
Cheers!
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