my first coil two light bulbs 100+60 watts lightning, I have to make proper measurement to prove it, is it making extra energy. I use 16 mm ferrite core length 400 mm and trafo from microwave oven. But since I do not know anything about el. power this is amazing for me. I just followed videos from youtube and forums and it is working now. Needs a lot time and effort to make it useable for everyone. And I also need to build flyback to make it autonomic.