1 Corinthians 3:13
[the quality of] each person's work will become evident [i.e., for what is it made of]. For the [judgment] day will expose his workmanship. And it will be revealed by the fire [of judgment], which will test the quality of a person's workmanship [i.e., the faithfulness of his converts].
Ephesians 5:13
But when all [such] things are exposed by the light [i.e., the truth], they become [clearly] visible [i.e., their true nature is revealed], for everything so revealed becomes illuminated. [Note: Possibly this means "it is light that clearly reveals everything"].
1 Thessalonians 5:5
for all of you people belong to the light; you belong to the daytime. We do not belong to the night or to darkness. [Note: In this passage "light" and "daytime" refer to spiritual illumination, while "darkness" and "night" refer to spiritual ignorance].