Ahha I been digging, I have never owned one of those bulbs before, so I didnt know what was in them. Your better off buying some plain high powered Leds. The reason is this.
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I am aware its a different shape, but its Led and its 7W. Yours will be similar inside, what it shows is caps and more sources for induction (the transformer type thing). So more and more I am convinced its a joint effort of inductive coupling and a crude inductor step up. The basic diagram I will do later will show you how the principle works of generating a high voltage, using a inductor,capacitor and diode.
As the pic clearly shows, your circuit contains all of them and in several places!! Only way you will pin this down is to run some basic tests. I will do the same, but you cant get any meaningful results the way your doing it. Its a shame because actually there is alot of things going on, things that kids would love if taught properly. But I am a bit reluctant unless you are ready to do it properly, you need to measure everything. Even a couple of really cheap Chinese multi meters will do.
But one promise I can make is, as soon as I get more wire I can prove 100% exactly what is going on. Then its upto you if you want to except the facts or not. As for other opinions.................
There may be different opinions on exactly what is doing what. But only the OU guys will come up with anything wildly different from what I have told you.
What make and model light is it, there might be a very slim chance I can get a schematic of the insides, or I might be able to buy one and take it apart.
In the next couple of days I will give you some tests to run, do them EXACTLY as I describe. They will give you definitive answers to some of the key questions.