Extend Time does not seem to augment the duration of night vision and glowing although it is an accepted augment by the Light spell. For instance, Self -> Light gives 30 seconds of night vision while Self -> Light -> Extend Time also gives 30 seconds of night vision, potentially wasting some Source. The same thing happens when casting Light on other entities - they receive 30 seconds of night vision and glowing whether or not an Extend Time augment is used.

Fixed on the latest version. https://www.curseforge.com/minecraft/mc-mods/ars-nouveau/files/3432816