See my thread on endless-sphere: https://endless-sphere.com/forums/viewtopic.php?f=2&t=79763. If you do some testing you may be able to find a lights output on your controller. You would then need to connect it to a fet or transistor.
Looking at one of d8veh's photos of the 09 bottle battery controller there's a 4 pin port next to the large resistor which looks like it might be for the lights.