![]() ![]() If you are working in metres, simply exchange the footcandle numbers for the appropriate lux numbers from the table and calculate your room area in square metres. Note: The lighting calculation example below is calculated using the imperial system (feet). If you are using a very small screen or smart phone, rotate your device to landscape view to read the table below. Below the table you'll find an example home lighting calculation for a kitchen. So in order to calculate your lighting needs for a given room, you check an illumination chart for the optimal number of footcandles or lux for a given task and then multiply by the square footage (or metres) of the room to obtain the number of required lumens.īelow is a chart for basic tasks and room functions. ![]() The other is lumens.įor those using feet, one footcandle is equal to 1 lumen/square foot.įor those using metres, one lux is equal to 1 lumen/square metre. One is Watts which measures the power draw of the bulb. When you purchase light bulbs there will generally be two numbers of interest on the packaging. One lux is the amount of illumination on a surface created by a light source of one candela that is a metre away from the surface. One footcandle is the amount of illumination on a surface created by a light source of one candela that is a foot away from the surface. (There is a far more technical definition if you're interested at Wikipedia's candela page.)įor those working in the imperial system: The lighting tables you'll be referencing will tell you how much light you need for each room or task in either footcandles (imperial measurements) or lux (metric).Ĭandela: One candela is equivalent to the illumination from one standard candle. ![]()
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