Quality of their pixels seems good. I cannot break the string of lights by pulling on it.
2 pixels out of the 2,600 I have used did not have all of the LED covered in epoxy.
Ray Wu also sell these, and in 12v too. I have not tried 12v but I can imagine they get hot.
Mattos Designs in the US also sell these.
Ray also looks to do different sized spacing between nodes.
so happy to see your amazing project , if some guys need this strings, please let us know , we are original manufacturer and keep the compeittive price for it . please contact us via tim@ledgiftsupplier.com . thanks.