Tried the whole rewire and rebulb with L.E.D.'s last year ... basicly it SUCKED !
Not enough brightness with LED bulbs, only looks bright when viewed perfectly inline with each bulb. very little radiant light to either side, so ... The overall lighting of you bike will seem quite dim when viewed from any angle other than straight on. NOT GOOD !
No light reflects from housings reflective backing with LED's either.
Others were selling conversions to do it, but not heard much about them this past year. Think while a slick idea, the LT would need specific housings with LED arrays and NOT bulbs to be worth while.
Scott