Sheesh.
When they talk about "the light getting brighter" I use this analogy-
Say you have a little kid. You are the mother and the father died because he was involved with drugs and was in a shootout and he had killed a bunch of neighborhood kids in the process of finally dying in that shootout.
So: when the kid is like, 3 years old you might say to her, "Daddy is not with us anymore and he's not able to come back- he was wounded"
When the kid is like 6 years old, you could tell her that Daddy died and that when people are dead they don't come back.
When the kid is like 10, you could tell her that Daddy was shot by some bad people.
When the kid was like 15 years old, you could tell her that Daddy was shot in the middle of a shoot out over drugs and that he had harmed other people.
THAT would be an instance of "the light getting brighter": You have the complete story, but you only let a little out every so often, based on what the child can handle based on her age. The story does not CHANGE but details are brought into the light as they are deemed appropriate at the proper time.
That is NOTHING like the JWs version of "brighter light"- they switch positions, decide previous positions are completely wrong and they believe something 180 degrees away from the original teaching, flip flop numerous times... it is NOT light getting brighter... it's light changing from green to red to blue to yellow.
SIGH...