The sensitivity range of most digital imagers include the 940nm IR range. They are, as a rule, NOT sensitive to the 10,000nm deep IR range made by heat, body radiation, etc. They are interpreting the 940nm IR emission as red. --Bob At 08:02 PM 7/3/2003 -0300, you wrote: >IFR --------------- NOTICE 1. This account can accept email & attachments up to 10M in size. 2. Federal Monitors: At request of client, some attachments are encrypted. Please DO NOT delay traffic; please reply with credentials for password. -------------- -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.