What is
 
  High reflection and flexibility PSR can make less solder mask crack and more bright than normal PSR.
PSR printing style
Competitor YoungEun
Normal PSR
(or IR) ink
High reflection white PSR

  Effect
     Brightness: Increased from 20% to 40%
     It can use cheaper Chip LED with low efficiency.
  Application
     Chip LED PCB
     TFT LCD Back Light PCB