I installed Malibu tier Lights along our sidewalk. The lights are 18w all metal and came with a "verde green" finish. The lights perform well and seem well built. The problem is that the verde green finish has faded to amost nothing. they now look just like black lights. Im sure I could exchange them at HD, but would it happine agian? Any way to prevent it from happining? and do all verde Green finish lights do this when in sunlight?