Anyone got the circuit details to build an auto voltage reduction from 12 volts down to 8 volts, Iam fitting some DRLs (L.e.d.s) to my car and want them on during the day and dimmed when i turn my car head lights on so we are looking at a voltage reduction circuit but also a wire linked to the head lights to detect 12v and then automatically switch over to 8v supplying my L.E.D.S hope i have explained this