A variable power adapter is required to drive a 6 V, 30 W incandescent   
   bulb in a microscope.   
      
   Similar to the 3-12 V 5 A adapter here.   
   https://www.ebay.ca/itm/305207182573   
   An adapter providing 1.5-6 V output would be better but I haven't   
   found one.   
      
   Rather than limit the adjustment to 6 V, I think of halving the   
   output.  An integrated circuit in a 4 port package is conceivable.   
   https://www.youtube.com/watch?v=VJfqBQ2ybpk   
      
   Does the marketplace offer a solution?   
   Another idea?   
      
   Thanks,                  ... P.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)