There are previous post on converting to LEDs - driving a dark green trad down sunken lanes a lot of the time, I always run on side lights and converted as many lamps as I could on the car to LEDs.

Less drain, brighter and more robust. Slightly blueish tinge on the four front side lights as others here may remember, only problem was that part of the wing light seems to have been made out of cardboard! Disintegrated when damp anyway, blowing the fuse and I think was the time that ALL the lights failed. Not entertaining. Now have the two add-on spots wired up on a separate circuit, just in case.