As standard the brake light output normally puts out a lower than 12V supply continuously (for the lower brightness rear light function) and ups it to the full 12V to get a brighter output when the brakes are applied. I suspect that if I set the HexEzcan rear light brightness to the same 100% as the brake light output, and turn off brake light flashing, then I will have a spare continuous 12V output which I can use to power some other accessory in future.