Denali Electronics DataDim dual-intensity controllers enable Denali driving lights to switch between half and full intensity with your vehicle's original high-beam switch. Simply plug this controller into the harness end included with their LED light kits to enable dual-intensity functionality. All Denali 2.0 light pods are equipped with a dedicated 3rd-wire dimming circuit. It allows the use of an external signal for reliably controlling intensity of the LED chip at the source. Order a Denali DataDim dual-intensity controller for driving light harness to set the intensity level for all your vehicle's lights with your high-beam switch.