All car headlights must have both high and low, or dipped beams. Some achieve this by using one individual bulb integrated with both high and low beam function, it is called Dual Beam bulb (basically H4, H13, 9004 and 9007). My understanding as an electronics technician is that LEDs (light emitting diodes) often have specific wattage requirements to light up, and many brands of LED headlights will only do High and low beams because the wattage to light up the LED on the DRL setting is too low.

My understanding as an electronics technician is that LEDs (light emitting diodes) often have specific wattage requirements to light up, and many brands of LED headlights will only do High and low beams because the wattage to light up the LED on the DRL setting is too low. All car headlights must have both high and low, or dipped beams. Some achieve this by using one individual bulb integrated with both high and low beam function, it is called Dual Beam bulb (basically H4, H13, 9004 and 9007).