Recommended Illuminance For Home Use lightingever.co.uk /blog/recommended-illuminance-f or-home-use/ First let us know more about illumination Illuminance means the illuminated object’s luminance f luxes per unit area. (lm/㎡), the unit is Lux. It can be measured by illuminometer/luxmeter and can be classif ied as horizontal illuminance and vertical illuminance. 1Lux means the brightness that 1 lm averagely distribution in 1 square metre place. (1 Lux = 1 lm/m2). And there is another unit of illuminance which is f oot-candle. It conveys “the illuminance cast on a surf ace by a one-candela source one f oot away”, the abbreviation is 1f tc (1lm/f t2) that is the illuminance when the luminance f lux is 1lm per square f oot. And 1f tc=10.76lux.
In order to have more perceptual understanding to illuminance, take an example to calculate it as f ollow: A 100w incandescent bulb will give out the whole luminance f luxes of 1521lm, if those luminance f luxes unif ormly distribute on a hemisphere, if we do not consider the ref lection of light on the surf ace of hemisphere, then we can calculate the illuminance of 1m away f rom light source( the 100w incandescent bulb) and the illuminance of 5m away f rom light source as f ollow: T he hemisphere’s radius is 1m, so the area of it is 2π *12=6.28 m², the illuminance of 1m away f rom light source is 1521lm/6.28m²=242.2Lux. In the same way, T he hemisphere’s radius is 5m, so the area of it is 2π *52=157m², the illuminance of 5m away f rom light source is 1521lm/157m²=9.7Lux.
T he application of illuminance and the reference standard of lighting design Illuminance can show the received luminance f lux in the surf ace of some objects. Because the illuminance can directly show the brightness of objectâ€™s surf ace, so all country are set up the lighting design standards according to the illuminance. Here I will introduce some illuminance standards f or home use in some countries, the unit is Lux. You can ref er to this in the daily lif e, and based on the dif f erent situations, illuminance is f lexible.
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Published on May 9, 2014
Illuminance can show the received luminance flux in the surface of some objects. Because the illuminance can directly show the brightness of...