368d0a4e   
   XPost: sci.electronics.design   
   From: MyNameForward@ReplaceWithMyVices.Com.invalid   
      
   In article ,   
    Phil Hobbs  wrote:   
   >   It has a FWHM of 40 nm, though, which is way too wide for my   
   > particular use.  (I may need to put interference filters in front of the   
   > LEDs, but I hope not.)  There are some 590ish ones that are narrower and   
   > still pretty bright, but I need to be able to distinguish 578 from 600   
   > pretty sharply, owing to the strong slope of the background absorption.   
   >   
   > What I really want is the equivalent of a nice bright 590 nm diode   
   > dunked in LN2 to shift it a dozen nanometres towards the blue.  (It's   
   > the 578 nm channel that I'm mostly worried about.)   
   >   
   > Cheers   
   >   
   > Phil Hobbs   
      
   Multicomp 87K7121 is a 590, 25 nm ("spectral half-width" - I suppose   
   that means 50 nm FWHM, so probably also bad for you - oh, well), 4000   
   mcd @20mW part   
      
   Optek Yellow: OVS5MYBCR4 in the "X" color bin is 585-588 peak 4500-9000   
   mcd (three intensity bins) @140 mW (much wider angle than the above)   
      
   I wonder how far you could shift on a TEC...?   
      
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