After stuydying JW's for over half a century, I haved concluded the following:
Old Light / New Light is a primary doctrine of Jehovah’s Witneses. When they abandon on old prophecy or change a doctrine, they characterize this as “old light”. When they issue a new prophecy or issue a new policy, they characterize this as “new light”.
The average JW is so indoctrinated and psychologically invested in Watchtower they cannot see the deception that is so obvious to outsiders.
Galatians 1: 8–9 shows that Christians have been sharing the same gospel message since the times of the apostles. This scripture TWICE curses anyone who preaches a message that the apostles didn’t preach. This scripture destroys the heretical JW doctrine of “new light”.
JW’s do not preach the Christian message. They imagine that they preach a message given to 144K male Jewish virgins spoken of in Revelation during the Great Tribulation.
Christians preach the apostolic message of “reconciliation with God” through the blood covenant offered in Mt. 26: 27–28 "for the forgiveness of sins" and being born again. JW's preach a future kingdom message that will be rather dramatically delivered by male Jewish virgins during the GT.
The Christian message:
2 Cor. 5 : Therefore, if anyone is in Christ, he is a new creation. The old has passed away; behold, the new has come. 18 All this is from God, who through Christ reconciled us to himself and gave us the ministry of reconciliation; 19 that is, in Christ God was reconciling the world to himself, not counting their trespasses against them, and entrusting to us the message of reconciliation.
Any questions, comments, disagreements or observations?