From: muratlanne@gmail.com   
      
   "(PeteCresswell)"  wrote in message   
   news:ksbqj71ma33av22kkdjvad0fdjnljgop59@4ax.com...   
   > Per v8z:   
   >>Any incandescent (halogen, xenon, etc. but not LED) light can be converted   
   >>inexpensively to an IR illuminator by simply putting a 720nM -920nM filter   
   >>over it.  I have a 2 d-cell xenon bulb mag-lite flashlite that has a 55mm   
   >>diameter 850nM photo filter ($8.00 free shipping on Ebay) attached to over   
   >>the lens with electrical tape.  It works better than the illuminator that   
   >>came with our NV monocular, and all that you see downrange is a very   
   >>slight,   
   >>dull red glow.  The same should work for a 12VDC Malibu light.   
   >   
   > That's something of a revelation to me.  Thanks!   
   >   
   > One of the downsides I keep hearing about motion-triggered floods   
   > is false trips by animals or whatever annoying the neighbors.   
   >   
   > The filter approach would appear to mitigate that.   
   > --   
   > Pete Cresswell   
      
   That filter wouldn't help. 720-920 nanometers is just below visible red,   
   corresponding to the black-body radiation of a very hot soldering iron,   
   which you can feel but not see. PIR motion detectors respond to intensity   
   changes in the ~10 micron wavelengths emitted around room and body   
   temperature. 1000 nm = 1 micron.   
      
   Avoiding animal trips takes some careful setup. I haven't because I once   
   stepped out the door barefoot at night and kicked a skunk that was on the   
   doormat. It didn't bite or spray.   
      
   jsw   
      
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