Football pitch lights needs to meet the functional needs of athletes, the audience’s requirements to enjoy the game, and provide high-quality television pictures for television broadcasters, and provide the referee with a fair decision light environment. In a word, Enough brightness lighting for football fields is necessary. When football stadium lights turning on, How many lumens do you need to light up a football field? This article will help you find the answer.
This article will explain the theme from the following points:
1, What is lumen?
2, How to calculate the lumens of LED stadium lights?
3, How many lumens do you need to light up a football field?
Section 1: What is lumen?
A.The Definition of lumens
The so-called lumens refer to a candlelight (cd, Candela Candela, the unit of luminous intensity, equivalent to the luminous intensity of an ordinary candle) corresponding to a solid angle of 1 square meter on a unit sphere with a radius of 1 meter.
If a light source emits one candela of luminous intensity uniformly across a solid angle of one steradian, the total luminous flux emitted into that angle is one lumen (1 cd·1 sr = 1 lm). Alternatively, an isotropic one-candela light-source emits a total luminous flux of exactly 4π lumens. If the source were partly covered by an ideal absorbing hemisphere, that system would radiate half as much luminous flux—only 2π lumens. The luminous intensity would still be one candela in those directions that are not obscured.
The lumen can be thought of casually as a measure of the total amount of visible light in some defined beam or angle, or emitted from some source. The number of candelas or lumens from a source also depends on its spectrum, via the nominal response of the human eye as represented in the luminosity function.
B.What is difference between lumen and lux?
The difference between the units lumen and lux is that the lux takes into account the area over which the luminous flux is spread. A flux of 1000 lumens, concentrated into an area of one square metre, lights up that square metre with an illuminance of 1000 lux. The same 1000 lumens, spread out over ten square metres, produces a dimmer illuminance of only 100 lux. Mathematically, 1 lx = 1 lm/m2.
A source radiating a power of one watt of light in the color for which the eye is most efficient (a wavelength of 555 nm, in the green region of the optical spectrum) has luminous flux of 683 lumens. So a lumen represents at least 1/683 watts of visible light power, depending on the spectral distribution.
Section 2: How to calculate Lumens of LED stadium lights?
Lumens are the units of luminous flux. The total amount of light emitted from the light source, expressed as F. The unit is lumens (Lm). The luminous intensity of the point light source is 1 canopy, and the luminous flux emitted at a unit solid angle (1 steradian) is “1 lumen”.
Since the output luminous efficacy of MECREE LED lights is 150 lm/W, the lumens of a 1000W stadium lights = 1000W x 150 lm/W = 150,000 lumens.
MECREE LED stadium lights is range from 100w-5000w, and the lumen of the LED stadium lights are 15000lm , 30000lm, 45000lm, 60000lm, 75000lm, 90000lm, 120000lm, 150000lm, 180000lm, 300000lm, 450000lm,600000lm, 750000lm.
Lumens to lux calculator
Lux: The amount of light that is cast on a surface is called illuminance, which is measured in lux. This can be thought of as light intensity within a specific area.
One lux is equal to one lumen per square meter (lux = lumens/m2). Essentially, as light travels from the emitter, it will disperse throughout an area. The further the light has to travel the more it will be dispersed. Therefore, the amount of lux in an area or on a surface can vary depending upon the distance the light travels and the angle at which it is dispersed.
Where the lumens provided by a given emitter are the same, light that travels less distance and/or is more narrowly focused will appear brighter because lux are concentrated in a smaller area than light that has traveled a greater distance and has been dispersed over a wider area.
Lumens to lux calculation formula
Calculation with area in square feet
The illuminance Ev in lux (lx) is equal to 10.76391 times the luminous flux ΦV in lumens (lm) divided by the surface area A in square feet (ft2):
Ev(lx) = 10.76391 × ΦV(lm) / A(ft2)
The illuminance Ev in lux (lx) is equal to 10.76391 times the luminous flux ΦV in lumens (lm) divided by 4 times pi times the squared sphere radius r in feet (ft):
Ev(lx) = 10.76391 × ΦV(lm) / (4⋅π⋅r(ft)2)
Calculation with area in square meters
The illuminance Ev in lux (lx) is equal to the luminous flux ΦV in lumens (lm) divided by the surface area A in square meters (m2):
Ev(lx) = ΦV(lm) / A(m2)
The illuminance Ev in lux (lx) is equal to the luminous flux ΦV in lumens (lm) divided by 4 times pi times the squared sphere radius r in meters (m):
Ev(lx) = ΦV(lm) / (4⋅π⋅r 2(m2))
How to convert lumens to watts?
This measures the amount of electricity a light bulb consumes. For example, a 100-watt bulb consumes 100 watts of electricity every second it is on. The higher the wattage, the more electricity you’ll pay for.
How to convert luminous flux in lumens (lm) to electric power in watts (W)?
You can calculate watts from lumens and luminous efficacy. Lumen and watt units represent different quantities, so you can’t convert lumens to watts.
Lumens to watts calculation formula
The power P in watts (W) is equal to the luminous flux ΦV in lumens (lm), divided by the luminous efficacy η in lumens per watt (lm/W):
P(W) = ΦV(lm) / η(lm/W)
watts = lumens / (lumens per watt)
W = lm / (lm/W)
What is the power consumption of a lamp that has luminous flux of 900 lumens and luminous efficacy of 15 lumens per watt (lm/W)?
P = 900 lm / 15 lm/W = 60 W
Section 3: How many lumens do you need to light up a football field?
Football led light has their own rules and standards requirement. Different lux level required for football stadium will have different lumens requirement.
1，Training and entertainment 200lux
For a standard football field, need about 360,0000lm to light up a soccer pitch.
2，Amateur competition 300lx
For a standard football field, need about 420,0000lm to light up a football stadium.
3，Professional competition 500lx
For a standard football field, need about 600,0000lm to light up a football stadium.
4，General tv broadcast 1000lx , TV emergency 1000lx
For a standard football field, need about 126,000,00lm to light up a football stadium.
5，HDTV large international competitions 1400lx
For a international standard football field, need about 309,000,00lm to light up a football field.
If you are not sure about how many lumens are needed in your football field, please do not hesitate to contact with us at [email protected]. Mecree has professional engineer provide you free football field lighting design.
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