A Joule Thief light using a 1N4148 switching diode on the base of 2 parallel NPN transistors (BD139) . There is a .47uF capacitor between the collectors and emitters. Around 600 turns for the secondary, 4 turns at the bases and 12 turns at the collectors. Any ways that i tried to take the ampdraw affects the circuit so it is impossible for me to know the real consumption...i am guessing around 250 milliamps. It is a lot of energy but how bright! better run this on a 1.5 volts battery pack.