From: hwabnig@.-   
      
   On Mon, 11 Nov 2013 10:31:05 +0000, N_Cook  wrote:   
      
   >A bright light source consisting of 3 rings of high power white LEDs.   
   >Each LED with a heaxagonal periphery 6 degree beam-spread lens. All   
   >lenses set on a spherical surface of 62mm radius. So 1 central LED plus   
   >lens, then 6 , then 12 then 12. Concentrates the light to the centre of   
   >the sphere in a square about 10mm x 10mm. This is a working cluster.   
   >If I wanted to increase the light at this spot would the following work?   
   >Remove the central LED and lens. Another 31 LED arrangement as the   
   >original. In the axial centre, now, an array of domes cut and polished   
   >hemispheres , from the tops of 5mm water clear basic LEDs.   
   >The flat surfaces of these close packed 5mm hemispheres set again to   
   >a spherical "surface" to redirect the incoming  light axially. Any idea   
   >what proportion of the outer set of light reaching 10mm diameter of the   
   >intermediary "focus" would reach the next "focus" of 10mm diameter ?   
   >Just approximate 70 percent / 80/90?   
   >Or any other kitchen-table "engineering" solution?   
      
   I wonder if anyone can grasp the concept.   
   How about a little drawing hand sketched and uploaded   
    to an image hoster?   
      
      
   w.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)