these LED's are "4th gen" type, they are freeking bright. bright enough that a resistor must be added on the park/tail marker lamp mode so you don't get pulled over for modified lights. assemblies aren't cheap due to the strobe feature, but that is an added bonus for LE/EMS vehicle builds. i'll post more on the specs later, pics in the meantime. the operational goal was to "plug in/add on" to current wiring so no warranty can have the hint of getting denied. to undo the work, a replacement taillight is required as well as the light bulb socket assy's