Kun is light and Vulon in night but there is no word for moon

I am not sure you want a word-for-word translation, since it loses its meaning in Dovahzul. It'd be more effective to use the Ta'agra phrase "Jobal Kha'jay" for that.

The "bright" equivalent is "shining" (viintaas). For the "moon" part, you might just have to refer to Masser or Secunda (Sekunda if you transliterate into Dovahzul as a loan word)

My answers: Viintaas Kunnesevulon (Shining light of the night), Viintaas Masser/Sekunda (Shining Masser/Secunda), original Ta'agra (Jobal Kha'jay). The Dovahzul equivalents are not the best, but it's what we have.