I have a regular 100 W halogen lamp with pretty small filament dimensions   
   located in 2 meter distance to a 45 degree large household mirror working in   
   reflection mode. The illuminated wall shows stripes easiey seen with bare   
   eyes. Moving and turning the    
   light source does not change the stripe pattern. Turning the mirror will   
   exactly turn the stripes too. The mirror is made of float glass.   
   The stripes have a peak-peak distance of let say one inch while the wall   
   mirror distance is around 3-4 meters. The brighter stripes have 25 lux while   
   the darker stripes have just 24 lux. A frosted lamp with 2-3 inches diameters   
   does not show the stripes.    
   When using an optical mirror instead of regular household mirror the stripes   
   do not appear. The regular mirror has a nice silver coated backside without   
   the cloudy image you get from real low cost miroors, when inspecting them in   
   transmission.   
   I have no clue where the effect comes from. Can someone help out?   
      
   Helge   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)