[quote name='musha666']Judging from the ads for it I would assume its loo-min-ess as well. But then again what do I know.[/QUOTE]
Gamespot editors agree with you!
On IGN, there's a video interview with Tetsuya Mizuguchi, the creator of Lumines. He pronounces it loo-min-ess, like in luminescence. I always thought it was loo-mins before I saw that video.