I ordered three. Upon arrival both were not working. Given the extreme simplicity of the device and assuming the LED block work, I pulled out my soldering iron, my multimeter, and I set to work. The failure is very simple, and must surely be the same for all those whose lamp is defective: the head of the lamp, in aluminum, must be electrically connected to the outer circle of the LED block. Outside, the tiny tin Point carried out cold in the factory does not take the shock. Just redo the weld properly taking the few seconds necessary to heat the aluminum head for tin grip, and everything is in order. All my lights work.
Some will say that a new product must operate on, without the need for prior repair. They are right, but this requires a "quality control" and therefore an equivalent model of a known brand is sold commercially to 25 to 30. This works very well (perhaps once repaired) for ten times cheaper. By cons, quality control ... is you!
