From: pcdhSpamMeSenseless@electrooptical.net   
      
   Hi, all,   
      
   I have a gig to design a microplate reader for a new bioassay system.   
   To match the reagent systems, it needs to work over a range of   
   wavelengths in the 340-500 nm region, none of which is particularly well   
   matched to mercury emission lines.   
      
   So, I'm casting about for a light source.  It really doesn't need much   
   power, maybe a few milliwatts per square cm in a 5-nm passband.   So   
   5-10 W output would be fine for an arc lamp, much less for a LED.   
      
   For particular purposes, I can get LEDs in almost any wavelength I need.   
     However, it would be very useful to have a broadband source.   
      
   Most white LEDs appear to cut off very sharply below about 420 nm, which   
   is pretty understandable given that that's the short wavelength tail of   
   the blue LED chip.   
      
   High pressure xenon lamps have nearly flat spectra in that region, which   
   would be terrific if I could find one rated at less than a kilowatt.   
      
   Any lamp- or LED-selection wisdom?   
      
   Thanks   
      
   Phil Hobbs   
      
      
   --   
   Dr Philip C D Hobbs   
   Principal Consultant   
   ElectroOptical Innovations LLC   
   Optics, Electro-optics, Photonics, Analog Electronics   
      
   160 North State Road #203   
   Briarcliff Manor NY 10510   
      
   hobbs at electrooptical dot net   
   http://electrooptical.net   
      
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