It seems like that article mainly focuses on light produced quite deep within the tissue (refers to centimeters of tissue), rather than just barely subdermally. For existing LED implants (including the xSIID), anecdotally it’s been found that green is actually the brightest, followed by blue, then red, and amber as the least bright. Amal mentions this in this forum post, and comparing my own blue implant to pictures of those with red implants, it seems to hold true.
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