Hella 500 question

hey all i just ordered my hella 500 they should be here in a weeks or so, but in th mean time im questioning how i will wire them, i will have 3 lamps on my light bar and i no the kit comes witht he wiring for two lamps, but im not sure if i can just cut into the wire run and add in a 3rd lamp or if there is something else i need to do this

any info will help

thanks

 

also curious about wiring three lights...