Susanc, I am so flattered!
Morphail beat me to the punch with the OED (lurve to you morphail), but to answer your question, susanc, about the adjectives: Both “lighted” and “lit” can be used as past participles or adjectives.
According to the OED they do have slightly different connotations, which could lead to some flutherers’ preferences for one or the other. While “lighted” is defined as “Kindled or illuminated”, “lit” means “Lighted, illumined”.
So, yes they are both correct, but each could be “more correct” in subtly different scenarios.
JasonJackson is right on with the assessment that there is a sort of “drift” in language. Some variants come into fashion and some go out. Sometimes this leads to one word becoming archaic, sometimes the words are used interchangeably indefinitely.