This experiment aims to determine the rotational speed of the generator to turn on the LED lights using a 6 Volt dynamo instead of the generator. Experiments carried out by adjusting the generator rotation to turn on the LED lights. To analyze the data used the induction emf equation. Based on the results of the experiments it can be concluded that the faster the generator rotation, the light produced is increasingly clear, because the dim light due to the deviation angle is almost invisible.