About the menorah of the Beis HaMikdash, the Baal HaTurim (Terumah) writes that when the Torah discusses the Menorah, the letter ך"סמ isn't mentioned. The letter ך"סמ represents Satan. There is no ך"סמ because when the Menorah was lit, there was no Satan and no dangers. We can add that the same occurs when we light the Chanukah lecht. There is no Satan, and there are no dangers.
In the home of Reb Shlomo Alter zt'l (a grandson of the Chidushei HaRim zt'l) they would light a candle whenever there was a need for a yeshuah. If someone was ill, or there was a יולדת, or even when the weather was harsh, they would light a candle. It seems that he received this custom from his holy ancestors. From the Baal HaTurim we mentioned, we understand the logic behind it. Lighting candles banishes the kelipos, the Satan, and it brings yeshuos.
