1. What Is Lumen?
Lumens can be used to quantify the amount of illumination provided by any type of lighting. Lumens are related to candlelight and represent the brightness of a standard candle, equivalent to an Angle of one square meter. If the light source is obscured by the right absorbing hemisphere, the system will begin to emit half of its luminous flux. Simply put, lumens are units used to measure the amount of visible light contained in a defined beam or Angle or emitted by a light source. The amount of lumen or candela a light source emits depends on its spectrum, which is measured by the normal response of our eyes.
2. Difference between Lumen and Lux
The difference between lumen and Lux is one of the most fundamental differences to understand. The difference between the two is that Lux considered the region in which the light was distributed. A flux of 1,000 lumens provides 1,000 lux illumination. It will be concentrated in an area of one square meter. If the same 1,000 lumens are spread over 5 square meters, the resulting lighting will be dimmed. A source emitting 1 watt of light would provide a luminous flux of about 683 lumens. In all, a lumen corresponds to at least 1/683 watts of visible light, depending on the distribution of the spectrum.
3. Lux to Lumen Calculation Formula
A Lumen is a unit of measurement for luminous flux. The amount of light emitted by a source is measured in microvolts (V). The unit of the lumen is denoted by the symbol Lm. The intensity of the point light source is 1 crown. The outgoing luminous flux is 1 lumen. Since the average light efficiency of LED lights is 150lm/W, the calculation for the lumens of 1000W stadium lights is 1000W multiplied by 150lm/W, which equals 150,000 lumens.
To simply convert Lux to lumens, you can also use a lumen-to-Lux calculator. Because light disperses as it leaves the emitter, the farther it travels, the more light it disperses and the less intense it is.
3.1 Measuring in Square Meters
To calculate lumens in square meters, you must consider the illuminance Ev in lux, which is equal to the luminous flux of lumens. So the luminous flux V is equal to the illuminance Ev in Lux (lx) times the surface area A in square meters (m2). Therefore, the formulas listed below are derived.
ΦV(lm) = Ev(lx) × A (m2)
3.2 Square Footage Calculations
In addition to square meters, you may also want to use square feet to calculate lumens. V lumens (lm) is equal to 0.09290304 illuminance Ev Lux (lx) times surface area A square foot (ft2). The formula is shown below.