When do you light twice on the same day
(not night) of Chanukah?
The second time, you add one more candle.
a)If someone didn’t manage to light all night long, he may still light even after *Alos Hashachar.
b)If for the following night he knows he will not be able to light , he may light during the daytime, after Plag.
Example: The seventh night he didn’t light.
He lights seven candles after Alos (Halachically
cmoonsidered day) In the afternoon after Plag
he lights eight candles. Same day he lights
*Shu”t Hisorros Teshuvah O.Ch 3: 463