There seems to be some debate on the matter, but the general consensus seems to be that you do not benefit from the Luck scales of an opponent's dominion. Some believe Luck 3 in an enemy dominion is treated as Luck 0. Others say it is Misfortune 3.
See:
Enemy Dominion + Luck/Misfortune
I am not sure which is correct. But, I am certain that red candles and shamrocks are not a good combination.