Super effective provided that we made no connection error. at the slightest mistake the result is quite confusing. I used LED 3W (as on the video presentation) and it had escaped me that it was recommended a power supply of at least 7V ... Powered in 5V, it does not work at all, but to 4,5V it works (but unstable), there I did not get too much. Finally, from 6V or more, it works nickel. Be careful to be clear between the Vin - and GND connections.
