Typically two Sabbath candles are lit, one to remember the Sabbath and one to observe the Sabbath according to Jewish texts, however some families may light more candles. They must be lit by the matriarch of the house in the window before sundown on Friday night as the beginning of the Sabbath. Men may only light the candles if there is no adult woman. Once Sabbath has begun, no one may light a flame as the time of rest has begun. Depending on the denomination and source, candles may stay lit for the remainder of the blessing or longer but may not be blown out.
During "Sabbath Prayer" Golde will light the Sabbath candles along with two other matriarchs of the families. The blessing will be "said" during the song.
Due to the scene ending, candles will either need to be turned off or blown out depending on if battery candles or real candles are used, indicating the end of the night.
Appell, V.S. (n.d.) Why are two candles lit at the beginning of Shabbat? Retrieved from: https://reformjudaism.org/learning/answers-jewish-questions/why-are-two-candles-lit-beginning-shabbat
My Jewish Learning. (n.d.) Lighting Shabbat Candles. Retrieved from: https://www.myjewishlearning.com/article/lighting-shabbat-candles/