Online Candela to lumens Calculator

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Candela to lumens calculator

Candela (cd) to lumens (lm) calculator and how to calculate.

Candela to lumens calculator

Enter the luminous flux in lumens, apex attitude in ranges and press the Calculate button

to get the luminous intensity in candela:

Enter Luminous intensity in candela: cd
Enter apex angle in degrees: °
   
Luminous flux result in lumens: lm

Lumens are certainly the most commonplace measurement for a mild bulb. The lumen (lm) is a measurement of luminous flux, or the complete quantity of visible light. To put it honestly, the lumen rating is how an awful lot trendy seen light is produced with the aid of a light supply. To show the distinction among lumens and candela, let’s circulate decrease again to the example formerly used for candela with the partially obscured light bulb. For a bulb emitting 1 cd, that bulb could simply have a luminous depth of 12.Fifty seven lm. Obscuring half of of the bulb (making it a hemisphere in choice to a whole sphere), a 1 cd bulb will emit handiest 6.28 lm. This is due to the fact lumens diploma the complete quantity of visible slight from a slight supply.

So why all of the unique scores? Since candelas, lux, and lumens are all measuring a few aspect distinct, you can benefit belief into how a lamp is beneficial. A laser pointer may have a completely low lumen price however a very high candela rating, given that a laser pointer doesn’t supply off very an awful lot mild however is seen from remarkable distances. Light bulbs are normally listed in lumens to reveal how a extraordinary deal illumination the exposed bulb produces. And lamps will often display a lux rate for a set distance to provide you an concept of the manner vivid your floor can be for undertaking lights.

For uniform, isotropic slight supply, the luminous flux Φv in lumens (lm) is same to the luminous depth Iv in candela (cd),

times the strong mindset Ω in steradians (sr):

Φv(lm) = Iv(cd) × Ω(sr)

The robust attitude Ω in steradians (sr) is equal to two instances pi times 1 minus cosine of half of the cone apex perspective θ in stages (°):

Ω(sr) = 2π(1 - cos(θ/2))

The luminous flux Φv in lumens (lm) is equal to the luminous intensity Iv in candela (cd),

instances 2 times pi times 1 minus cosine of half the apex attitude θ in stages (°):

Φv(lm) = Iv(cd) × ( 2π(1 - cos(θ/2)) )

So

lumens = candela × ( 2π(1 - cos(ranges/2)) )

Or

lm = cd × ( 2π(1 - cos(°/2)) )



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