Why is is that components for SMPS's for military use undergo vast amounts of component testing?......is it because they are worried that they may be fake components, not up to standard?
The military demands, and is willing to pay for 100% certainty,
and does business through elaborate specifications aimed at
getting just that. Whereas your consumer market will gladly
take "just good enough" to some confidence level, in order to
get to the right price-point in volume production. In between
you have stuff like automotive / industrial, where you may
actually perform testing of packaged units at more than one
temperature, etc. but not likely the Group _ testing pertaining
to package integrity and abnormal conditions.
You might inspect a sample LED for a manufacturer's logo.
You could purchase a sample from the manufacturer directly
and use it as a comparison for physical construction. Most
of the major components distributors are all spun up now
over "counterfeit" parts and should be pretty trustworthy.
It's the lower tiers and private brokers that are most likely
to engage in substitution, rebranding, refurbs.