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There are different series:

The R878 -20 (R878HA equiv)  for the blue
The R550HA  for Green/Red

R2154-05   Blue
R3256-02   Green/Red

The second set I mentioned are the newer versions.  They don't make that much
difference, however  scintilation has been noted on the newer version on the
blue channel if hi-light option is fitted and one overdrives them.  The word is
compromise!  Pay your money, take your choice or take a poll!

That's the deal

Ken at Videng