IMO the boards that are using 3rd party diodes (osram) are made in USA or China
boards using only samsung diodes are made in south korea by samsung, inlc diablo. samsung wont pay to use 3rd party parts.
the orignal drivers were made in china but the quility was all over the place killing some lights. so they moved production to taiwan (its not china FYI)
as for the difference between HLG/Spiderfarmer is R&D / diode placement / pcb layout etc, yes both compines are using partly the same diodes but efficiency(lm/w)/longevity(voltage) (binning) is important, people using lights with epistars will notice a little decrease in light before someing using cree/osram.
SF seen that some peoples lights were been killed by humidity so added coating, thus trapping heat reducing total life. it wont die from a humidifyer but it will die faster overall,
