This is precisely why the GB has worked hard to try and remove the terms from the vocabulary of the Witnesses.
They have not used the terms in the context of doctrinal understandings for many years. The online library going back to 2000 has nothing with these phrases. "Progressive/increasing light" and "clarification" are the terms you should use. They don't even use terms that would suggest what went before has changed.
Indeed...dubs will say to me the new light doesn't replace the old...well it does if it is wrong!
Ah but it is like lighting a candle in a dark room....getting brighter and brighter they say.
Except, as new light comes on, the old light is getting blown out...is the room getting any brighter?
NO!