Not really. You could explain it with something similar to an oathbreaker paladin from DnD.
Or a void elf that learned to handle the light through extreme dedication. With the newer high elf like customization for velfs you could even explain that the light slowly recovered their appearance and they are able to balance between these two opposite powers.
Lore and Consistency will have to give leeway to Gameplay. I mean, we reached the point where a pure Fire ability deals 100% damage to a Fire Elemental. Void-Light and other opposites having no specific interactions will become the norm.