His brake light needed a new bulb, and he managed to make this 12V LED bulb work in the 6V socket ... LED tower and adjust the current limiting circuit inside, but he felt it was easier to ...

Using properties of a series circuit, the sum of the voltages across the LED and resistor R must equal the supply voltage. \({V_s} = {V_{LED}} + {V_R}\) Now substitute the supply voltage (\(6V ...