When upgrading from incandescent bulbs to LUMENS LED bulbs, many factory turn signals will “hyperflash” (flash very quickly) due to the change in resistance from a standard bulb to LEDs. LUMENS LED Flasher Relays are used in conjunction with LUMENS LED bulbs to slow the signal flash rate back to normal. If the vehicle is equipped with a signal relay, using these relays would be more cost-effective than installing resistors to maintain the flashing signal speed. Furthermore, it is much easier to replace a relay than to solder in multiple resistors in the vehicle.