![]() The illuminance E v in lux (lx) is equal to 10. In lumens (lm) divided by the surface area A in square feet (ft 2): However, the same 1000 lumens spread out over 10 square metres produces a dimmer illuminance of only 100 lux. A flux of 1000 lumens, spread uniformly over an area of 1 square metre, lights up that square metre with an illuminance of 1000 lux. The luminous flux V in lumens (lm) is equal to the illuminance Ev in lux (lx) times the surface area A in square meters (m 2 ): V(lm) Ev (lx) × A(m 2) For a spherical light source, the area A is equal to 4 times pi times the squared sphere radius: A 4 r 2. The illuminance E v in lux (lx) is equal to 10.76391 times the luminous flux Φ V One lux is equal to one lumen per square metre: 1 lx 1 lm/m2 1 cd Lux to lumens calculation with area in square meters. The same light source that needs to illuminate 10 square meters, which illuminates this area with only 50 Lux. For example:Ī 500 Lumen light source illuminates 1 square meter with 500 Lux. A flux of 1000 lumens, concentrated into an area of one square metre, lights up that square metre with an illuminance of 1000 Lux. Please note that one foot-candle 10.76 Lumens, which means that in order to convert foot-candles to lumens, I would need to take the amount of foot-candles that I measured, 50 foot-candles ,and multiply by 10.76 to get the number of lumens (50 x 10. The difference between lumen and lux is that the lux takes into account the area over which the luminous flux (lumens) is spread. If the amount of Lux is indicated by a lamp, it is usually in the centre of the beam where the light intensity is highest. ![]() This value is irrespective of the number of light sources it uses, the colour or the structure where the light shines. Thus, it is important in what direction the light source shines. ![]() It enables us to measure the total "amount" of visible light present and the intensity of the illumination on a surface. Lux is used to measure the amount of light output in a given area - one lux is equal to one lumen per square meter. With LED lights this value is much higher because they need less power to generate a particular Lumen current. This is called the Lumen / Watts ratio (Lm / W). In Lumen, efficiency is especially important because it indicates how efficient the light source converts power into light. This indicates the total amount of light emitted by the light source, no matter what direction it is. What do these values mean and what's the difference? Sometimes this is indicated in Lumen and sometimes in Lux. When purchasing a lamp, it is nice to know how much light the lamp is giving out exactly. In square meters for any light source and press the Calculate button to get the illuminance in lux: Enter luminous flux in lumens: Luminous flux in lumens (lm) to illuminance in lux (lx) calculator and how to calculate.Įnter the luminous flux in lumens, select area unit type, enter radius in meters for spherical light source or surface area
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