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How Much Light Do I Need?

How Much Light Do I Need For My Room?

There's actually a proven formula for calculating the proper amount of general light (usually expressed as the number of watts) you should have in each room or area of your home . . . And it's not difficult, just some basic arithmetic. Multiply the length times the width of the room. Then, multiply that number times 1.5. That gives you the amount of wattage you need to light the room properly for general illumination.


A room is 12 ft. X 16 ft. (12 x 16 = 192). Then multiply 192 x 1.5 = 288 watts.

That means an 8-light chandelier using 40-watt bulbs would give 320 watts, which is even more light than needed.

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