First, a quick correction: both expressions should be hyphenated. So, the question should be: “A well-lighted room or well-lit room?” The reason is that when you generate an adjective by joining two words, the two terms should be hyphenated: a two-night show, a double-edged sword, the phone-swapping arrangement, etc.
Then, the main question: is it well-lighted or well-lit? Here, we are indirectly looking at the past tense and participle forms of the word “light,” when used as a verb. Is it lighted or lit?
The fact is that “light” is another example of irregular verbs — one that does not follow the regular/predictable way of adding -d or -ed to the base verb. Unlike come, go, beat, and swim, etc., each of which has just one past tense/participle form (came, went, beaten, swum), “light” has two past tense/participle forms, which are “lighted” and “lit.”
In other words, both are correct:
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