Honoring the Festivals and Hanukkah

[Rabbi Immanuel Schochet]

I would go so far as to suggest that if Noahides want to light candles in honor of the Jewish Sabbath or Holy Days, they can do so but in context of enhancing the meal(s) they are eating on that day (since it is a custom of the world in general to light candles for enhancing the atmosphere of any meal), but to do so when sitting down to have the meal (this would be after sunset for a dinner - for example, to weekly mark the seventh day which begins after sunset - unless it is summer and they want to have their meal earlier).