In Scripture only the king of Bablyon is referred to as Lucifer and that is in Isaiah 14:12. It was only later that Church Fathers started applying the name to Satan.
The Hebrew word ‘heylel’ has traditionally been translated as ‘lucifer’ (Latin for ‘light-bearer’), as in the Vulgate, Douay-Rheims and King James Versions. However, the New American Bible translates it as ‘morning star’ and the Revised Standard Version translates it as ‘Day Star’:
"How you are fallen from heaven, O Day Star, son of Dawn! How you are cut down to the ground, you who laid the nations low! You said in your heart, `I will ascend to heaven; above the stars of God I will set my throne on high; I will sit on the mount of assembly in the far north; I will ascend above the heights of the clouds, I will make myself like the Most High.’ But you are brought down to Sheol, to the depths of the Pit. (Isaiah 14:12-15, RSV)
Thanx Todd:
I think that may score some points for the side that says Lucifer and satan are different beings