Even if you are just lighting one room, there is a formula for calculating the amount of lights that are needed for sufficient home lighting. This most important factor when lighting a home is identifying the amount of wattage that is needed for each room.
The mood of a room can really be set with the correct level of lighting, so here is a basic formula for determining the correct amount of wattage in each room: Multiply the square footage of the room [length x width] by 1.5. The final answer provides you with the amount of wattage required to give the room good all around illumination.
For task lighting, as in an office, reading chair, or kitchen island, multiply the square footage of the room by 2.5 instead of 1.5. This formula will produce the correct amount of light needed so that it is sufficient to read, cook, crochet, etc.
Hallways require lights every 8-10 feet. The lights should be at least 7 feet from the floor. To determine the width of your chandelier in the foyer, add together the length and width of the foyer [in feet]. This will give you the size of the fixture in inches.
In the living room, the majority of the lighting should come from a chandelier or flush mount fixture. Wall sconces and table lamps should be added as necessary for tasks. In the bedroom, the general idea is the same, where one ceiling light provides the majority of the lighting, and tasks lights (such as table lamps or floor lamps) are added as necessary.
Home lighting is easy to select if you follow these simple guidelines. While every home is different, you need a consistent amount of wattage to light each room. If you are in the process of shopping for house lighting, take a moment to plan your purchases. Make notes for each room, including size, necessary wattage, and task lighting needs.