1) There were seven candles on the menorah
2) In The Shape of the Liturgy by Dix, he says that the 7 candles might have been inspired by the account in the Apocalypse (The book of Revelation) to "give a Christian turn to the old secular emblem. The bishop is the earthly representative of Christ as the Eucharist is the earthly manifestation of heavenly worship and the adaptation would easily suggest itself."
3) Atchley says, "The number of the seven candles borne before the Pope was probably derived from the Book of the Revelation. One cannot help noticing a similarly between the heavenly worship therein described and parts of the ceremonial of solemn Mass at Rome. We are told of a 'throne set in heaven, and one sat on the throne...And I saw in the right hand of him that sat on the throne a book': and under the altar the souls of them that were slain for the Word of God/Angels and the elect clothed in white robes' stand about the throne , singing to God and the Lamb.
4) The number seven also play in with the original seven ecclesiastical "districts" linked to Pope St. Fabian. they had seven bishops, deacons, and subdeacons.
5) In the commentaries of the Middle Ages it was common to link them to Temple worship, or with the "sevenfold" priestly virtue" or the seven angels or the Holy Spirit and his seven gifts. taken from the Catholic Answers forum
The Bible interprets itself:
"This is the meaning of the seven stars you saw in My right hand and the seven gold lampstands: the seven stars are the angels of the seven churches, and the seven lampstands ARE THE SEVEN CHURCHES." (Rev.1:20 NLT New Living Translation)
If comment is wanted... Matthew Henry adds:
"...The churches receive their Light from Christ and the gospel, and hold it forth to others. They are golden candlesticks; they should be precious and pure; not only the ministers, but the members of the churches; their Light should so shine before men, as to engage others to give Glory to God. And the apostle saw as though of the LORD Jesus Christ appeared in the midst of the golden candlesticks. He is with His churches always, to the end of the world (age), filling them with Light, and Life, and Love..." (Matthew Henry's Concise Commentary: Revelation 1:12-20)
The cake with 8 candles would burn longer compared to the cake with 7 candles as there are more candles providing heat and flame to keep the candles burning.
In the Kinara it hold seven (7) candles
A Kinara holds seven (7) candles.
It means that they are candles
7
Candles can represent lots of things
Taper candles come in 2 common sizes, 1/2" or 7/8". they are warped in beeswax and can burn for up to 7 hours depending on the size of the candle. Taper Candles requires a taper candle stand as the bottom of these candles are usually round.
Las velas.
The light of God
Not sure what you mean, but unless question is made clearer, candles are not a resurrection of Jesus.
It can mean "candle", "sail", "sailing".
What does "waxier" mean?