From: mathias@koerber.org   
      
   Hi.   
      
   I have a webcam with 'IR' mode, which also has 'IR' illuminating LEDs   
   for nightvision. However, those are still quite visible red. I would   
   like to block the visible portion to make them invisible.   
      
   Replacing the LEDs with real IR (I have a few TSHA5502 lying around)   
   ones might be possible, but if possible I'd like to avoid having to open   
   this device if possible...   
      
   I read some suggestions that unexposed/developed slide film makes for a   
   good filter, so I got one Fuji Velvia 100, but still does not markedly   
   affect the visible red spectrum.   
      
   Another suggestion was a few layers of Lee Congo Blue #181 and Primary   
   Red #106 filters, but that too does not block the visible portion.   
      
   Would anyone have any other suggestions? I would love to avoid paying   
   for really expensive filters...   
      
   any tips are appreciated..   
      
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