When a lot of people think about interior design, they think about furniture and decor. A number of people never stop to think about the impact that lighting can have on a room. Lighting is very important, especially when it comes to interior design because it can change the whole atmosphere. Here are a few things you should keep in mind when you're working to improve the look of your home. 1. Lighting Can Change The Look Of A Room If you have a room that looks dull and drab, you may want to make a few changes to the lighting.