Listen to this evening's class here.
Follow along with some of the sources: a) Masekhet Shabbat (21b), b) Maskhet Shabbat (23a), c) HaRambam (Hil. Hanukkah 4:2-3), d) Shulhan Arukh (671:2), e) Mikra'ei Kodesh (Hanukkah pg. 28-9), f) Shu"t R. Akiva Eger (2:13).