When installed on the right the positive and negative electrode: Normal LED light is on, has electronic current across the entire circuit;Canbus LED light is also on, has also electronic current across the entire circuit. As the following pictures with T10-9 LED SMD5050 and T10-9 LED SMD5050 Canbus LED:

When installed on the reverse the positive and negative electrode: Normal LED light is off, doesn’t have electronic current across the entire circuit;Canbus LED light is also off, but still has electronic current across the entire circuit. As the following pictures with T10-9 LED SMD5050 and T10-9 LED SMD5050 Canbus LED: