Ok guys, I tried!   
   If I directly connect the PNP base to battery negative the LED lights up as   
   bright as possible but it never turns off, even if I put everything in the sun.   
   If I add a 5k resistor between PNP base and battery negative it works as   
   expected, so it automatically turn on and off according to the amount of light   
   on the solar panel, but the led brightness is not much even when I cover the   
   panel or if I disconnect    
   it.   
   Ideas?   
      
   Thanks a lot!   
      
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