DataDim™ Dual Intensity Controller for Driving Light HarnessThis DENALI DataDim Dual Intensity Controller enables the DENALI Driving Lights to switch between half and full intensity with your vehicles original high beam switch. Simply plug this controller into the end of the harness included with our light kits to enable dual intensity functionality. All DENALI 2. 0 Light pods are equipped with a dedicated 3rd wire dimming circuit so we can use an external signal to reliably control the intensity of the LED