Obviously you are mostly going to get those that do not believe the Bible to be accurate responding to this. But the Bible witers don't claim to have written it on their own. Unlike the WT, the Bible claims to be inspired of God. It was God writing it through men. This means that the originals (not the copies) are claimed to be inerrant. There was no "new light". There isn't a single time in the Bible where a writer wrote something, and another writer says "No, that was wrong and false. This is the new light."
The Bible DOES opperate along the lines of "progressive revelation", however. God revealed a bit at a time until it was complete in Jesus Christ. But this is far different from "new light". God didn't have something wrong and have to fix it later. However, he revealed things partially as history progressed. That is why Paul could say that the OT was like looking through a dim mirror.
Whether you believe the Bible or not, it is not like "new light".
New light, according to the WT is based on Proverbs 4:18. Interestingly, even this verse does not support their teaching of "new light". It refers to ACTUAL light getting BRIGHTER. If something is wrong, it's not light. But the verse talks about real light increasing. It's also not a prophecy. It's a PROVERB. It's a general truth that as a person progresses in anything, they will grow. This is true also with the man of God. A person. An individual. They will grow and progress and get stronger in their walking with God.
So yes, the Bible was written by imperfect men. But they didn't claim to write this without God. It's been illustrated like a glove. A glove can do nothing on it's own. But when a hand is insterted into the glove, the glove acts.