I say light as well. It's the same in Spanish, and one of my favorite words/roots.
One of my favorite Spanish names, as well. Plus, I've always liked "Lucifer", even though nobody can really get away with naming a kid that (there's a thread here somewhere recently which alludes to that).
Oddly, another favorite name of mine is the Russian "Svetlana", which means the same, but, coming from a completely different root, sounds nothing like it. And I liked both names before I knew they had the same definition.
Also, sorry for not answering your previous question. You did such a good job with possible alternate definitions, and I couldn't come up with anything to grasp at as far as roots, that most of the choices seemed every bit as viable as others. Though there was something about the word which suggested trickery, and I was racking my brain to try to come up with a root or reason why it would feel that way, and narrow it down further between ruse and trickster, but never got any further.