I understand it means "lots of light for you" but I am hoping to get an origin and a better understanding of what this means? Is it religious? Is it slang?
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Light here usually stands for
insight, in a sense that has also existed in English since at least the 18th Century (think of the period known as "Enlightenment"). Then, wishing "light" means wishing for the person to be "enlightened".
It can also stand for
hope, as in "Ver uma luz no fim do túnel." (light at the end of the tunnel), or, in general, a positive state of mind.
It's very often at least vaguely spiritual, or even religious, where "light" is usually associated with some God, often the Biblical one.
It can also mean
good fortune, like in "Que Deus ilumine seu caminho" ("May God lighten your way."), where one's essentially wishing easier, lighter paths, i.e.,