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Aim to use as much natural light as possible. However, don't rely on a single source of light to light your living room. Try to blend several layers of light from multiple sources. Use a combination of ceiling lights, table lamps, sconces, and floor lamps to achieve balanced lighting in your living room. Pay attention to the corners. If you have a lamp in one corner, position two more in the room to try and balance the light. Use tall lights to give the impression of a higher ceiling. Dimmers give you the opportunity to change the feel of the room whenever you like. If you like to host parties, you can use your dimmers to create a flattering light. Choose LED bulbs that provide bright white light and dim them as needed. Dimmer switches can extend bulb life and conserve energy. Consult an electrician if you want to add dimmer switches to your lights. If you plan on watching a lot of T.V. in the room, make sure your lights aren't going to cause a glare. To make the room more suitable for winding down, keep the light low. Certain areas of your living room may be devoted to a specific task. Put a lamp on your desk if you work in your living room. If you have a reading chair, position a lamp nearby.

Summary:
Create layers of light. Install a dimmer. Make the lights fit the function of the room.