ALEX!; if you figure out the resister, (the value ) to use on the LEDS, could you share it with us???; is it used to lower voltage, current or BOTH!?;
It lowers both, but its primary purpose is to limit the current. (This being generally true of electrical items. It is the flow of current that ends up performing the useful work, the voltage is just what it takes to induce the electrons to move suitably. That said, measuring the voltage is much easier to do, and is often a perfectly adequate means of seeing what's going on.) -- Jim
