I actually love it! Not totally sold on the first and last together without the middle to add the flow. But overall, I say go for it.
Lux is a cool, spunky name that projects a spirited attitude. I also think Lux, works with Domino as well. Lux and Domino have a similar edge, they both look edgy and intriguing along with sounding daring. Domino is a very unusual, daring choice that has bags of attitude. You need a name as equally as funky as Domino which Lux is. Lux is has similar qualities to Domino and they look very electric together. I also love Lux with Josephine which is a gorgeously vintage choice. I love the name Josephine. Lux Josephine sounds lush.