The Modern Dining Room: Lunch vs. Dinner?
Not sure what you mean by "experience" but the only difference I've ever discerned between the lunch and dinner services (aside from the menu/courses) is the clientele.
At lunch there are more groups in full blown banker suits doing their "power lunches" whereas at dinner there are more tables where it's obvious people are on dates.
Can't really go wrong either way (although I think there's something to be said about how the courtyard looks at night, all lit-up)
Not so much atmosphere, but more the service provided by the restaurant. Many places save specialties for dinner service, so the kinds of differences I'd be interested in include a difference in the number of amuses, variety or existence of the mignardises cart, bread service, etc.
Not concerned with differences in portion sizes.
The lunch we had there in March was wonderful, but instead of the mignardises cart we were served a few on a plate (I don't remember seeing the cart brought to other tables).
A varied amuse also served on one plate, I think at dinner there are two.
Dinner is full-bore with the mignardises. Bread service same at both.
Lunch is more businessy and dinner more date-y, as ipse said.