r papi

if a person was in the hospital and could not light they would not have a knas. this is the reason why the first week after a lady has a baby the husband is supposed to light. however,nowadays we have electricity and most poskim hold that you are mikayem hadlakas neiros with them. in fact alot of poskim say you could even make a bracha.

As to the original poster: you have a kenas if you miss lighting on yom tov because you have a chiyuv hadlakah on yom tov too. As to your 2nd question you would not light yom tov by day because the whole reason for hadlakas neros is to have light at night once you missed it you can’t make up for it there’s a kenas. According to R’ moshe feinstein and the sheivet levi if you had your electric lights in your house on (and they weren’t turned on with the intention of kavod and oneg shabbas) you are chayav a kenas for the rest of your life however R’ dovid kohn paskens as long as you had light then there isn’t a kenas. The shela (as brought down in the magen avraham in siman 263 says you should light 7 or 10). Also since women usually were unable to light the first shabbas after they gave birth(nowadays we have electricity) its brought down in mishna berura that the husband should light for them.