Make sure you use warm white lights that is quite intimate, and relaxing. That is often done with a designer pendant light hung just above the table using an Edison globe. Provides the perfect experience IMHO!

Other than emergency lights, you should ensure the lighting is for your customers not for your staff. So you should create warm atmosphere with a welcoming mood. 

I've seen LED strip lights on the walls that did a wonderful job.

Lighting can literally make or break a restaurant.

If your budget is very small, you can install warm white gimble downlight (make sure they are gimbles, as you will want to adjust them) which are dimmable.

A dim table lamp on each table (you can get LED table lamps that actually flicker like candles these days) makes a lovely touch, and also enables patrons to read the menu which is sometimes very hard in dim lighting.

warm white downlights above the bar area makes for a perfect little scene in restaurant.

This dim, moody, romantic lighting. This will enhance the experience and motivate the customers to buy wine and spirits, which is a huge money spinner. 

Lighting should make the patrons isolated from other tables.

Whatever lights you choose there are two guidelines:

1. They should be warm white.

2. They should be dimmable.