Hello, thank you for your answer,
I am not a pro in electronics, I understand some basic things because I am a maintenance technician, but I really work with more powerful voltage (380v).
I have a small multimeter, but that’s all, I think that on the forum, there are people who have done a lot of testing on the joule thief, that’s why I would like to take the best possible assembly for my case, maybe a chip type ZXLD381FHTA or other, will be more efficient, I do not know, because it seems to me that the cut is done at 0.9v.
I would really like to find a solution for a led or 2 leds for the night (just to have the light in the room very low, for the fear of monsters)