Are the elves in The Hobbit different than the ones in LotR?

[*Varda*]

I agree they were pretty different. Personally I think this is due to

a) The different writing styles in the hobbit - the elves were meant to be happy and jolly etc - although it seemed to me they were on drugs of some sort

b) In LotR everything was getting more serious. The elves knew their time was approaching it's end and they could go into the West or remain in Middle Earth. They also knew that when the One Ring was destroyed their rings would lose power and many beautiful things would be lost.

For if you fail, then we are laid bare to the enemy. Yet if you succeed, then our power is diminished, and Lothlorien will fade, and the tides of time will sweep it away. We must depart into the West, or dwindle to a rustic folk of dell and cave, slowly to forget and to be forgotten.