I went to the Dapper Lighting website:
https://www.dapperlighting.com/pages...-high-low-work
If I'm understanding the concept, there is only one "filament" in the bulb.
The dimmer switch is used to energize/de-energize a "shield" inside the bulb that changes the beam configuration from that one "filament".. The dimmer switch in our trucks switches between two separate filaments for hi and low beams.
If I'm correct on how the Dapper system works, it's not plug and play, some wiring and switch modifications are necessary for this system to work..