‘But all things when they are reproved (convicted, brought to light) are revealed openly by the light. For everything that is revealed openly is light.'
The result of the convicting power of their lives will be that in some people there will come conviction as the light shines in their hearts and what they are is made clear to them, they will feel reproved as they see the glory of Christ (2 Corinthians 4:4-6). And the effect of this will be that they too become light as God works on their lives. For when God's light reveals openly what men are, and they do not shy from the light but respond to it, that light transforms them into light (compare John 3:19-21).
‘For everything that is revealed openly is light.' Darkness, and that which is in darkness, never reveals itself openly. Only those who come to the light reveal themselves openly and do not hide in the darkness. And then they themselves become light as God is light.