Kichler
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Kichler Lighting Gallery

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.

Example: 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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Kichler added this to Selecting Lighting Guide
November 27, 2012
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. Example: 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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