I don’t know how much either of these lights can be ‘improved’ by modding ?? Except for personal preference stuff like different leds for different tint or different driver for different UI.
Lexel could probably help out with a driver. As far as leds - are you willing to reflow? I don’t know if you can get pcb’s to suit the Q8?? A premounted led for the L6 should be easy enough to find.