theres a 12v dc-8amp dimmer switch with 2 input and 2 outputs, on[ebay] that could turn the voltage down [experts correct me please if i,m wrong], but at only £3 a pop inc p&p i,ve ordered one to find out. comes from china so should be 3 weeks. i think you just cut the power leads from the controllers and connect it in line. i need advice as well, so could you electrical guys give me a few pointers. john.