If it's @NE1's box, it isn't an LED driver.
Good write-up on LED's though.
I had to put 8 ohm, 50 W ceramic resistors in series/parallel with the after market LED's a retrofitted to my MY2014 Ranger WY. The BCM (Body Control Module) that handles CANBUS electrical stuff that's installed at the factory is programmed to see filament globes or constant current devices. The only ones that don't need resistors are the high-beam. However, without resistors, the low-beam would work for a few hours before the BCM cut off the supply which needed a BCM reset.
You may also note a lot of vehicles with what's called 'hyper-flashing' of their turn signals. This is because they have replaced stock filament globes with LED globes but haven't bothered to add the driver and/or resistor. Vehicle turn flashers still mostly work on the old-fashioned bi-metallic strip that heats up and cools down thus making and breaking the 12V to the turn signal globes. Since the flasher module sees a different resistance (almost a short circuit with an LED), it heats up/cools down faster, hence the high speed blinker or hyper-flashing. They may think it's cool but in effect, it is reducing the visibility of the turn signal by over 50%, especially from a distance.
When they then replace OEM lenses with dark tinted ones, the hyper-flashing makes the turn signal very hard to see in daylight. Bloody annoying!