hello
replace the rear brake lamp bulb with a led one
this will free up about 15 to 20 watts that can be used other places
also stuff the biggest and best battery you can in the battery box
as it will buffer sudden surges in current flow as you turn them on and
off use relays to turn them on and off not stock bike wires
watch battery voltage if it drops to less than 12volts your pulling too much
current turn something off
running them in town at slow speed is not a good idea as charging systems on most bikes dont put out a lot of power till running at 4000 rpm
or better