Candela (cd) to lumens (lm) calculator and how to calculate.
Enter the luminous flux in lumens, apex angle in degrees and press the Calculate button
to get the luminous intensity in candela:
Lumens to candela calculator ►
For uniform, isotropic light source, the luminous flux Φv in lumens (lm) is equal to the luminous intensity Iv in candela (cd),
times the solid angle Ω in steradians (sr):
Φv(lm) = Iv(cd) × Ω(sr)
The solid angle Ω in steradians (sr) is equal to 2 times pi times 1 minus cosine of half the cone apex angle θ in degrees (°):
Ω(sr) = 2π(1 - cos(θ/2))
The luminous flux Φv in lumens (lm) is equal to the luminous intensity Iv in candela (cd),
times 2 times pi times 1 minus cosine of half the apex angle θ in degrees (°):
Φv(lm) = Iv(cd) × ( 2π(1 - cos(θ/2)) )
So
lumens = candela × ( 2π(1 - cos(degrees/2)) )
Or
lm = cd × ( 2π(1 - cos(°/2)) )
Find the luminous flux Φv in lumens (lm) when the luminous intensity Iv in candela (cd) is 300cd and the apex angle is 60°:
Φv(lm) = 300cd × ( 2π(1 - cos(60°/2)) ) = 252.5 lm
Find the luminous flux Φv in lumens (lm) when the luminous intensity Iv in candela (cd) is 350cd and the apex angle is 60°:
Φv(lm) = 350cd × ( 2π(1 - cos(60°/2)) ) = 294.6 lm
Find the luminous flux Φv in lumens (lm) when the luminous intensity Iv in candela (cd) is 500cd and the apex angle is 60°:
Φv(lm) = 500cd × ( 2π(1 - cos(60°/2)) ) = 420.8 lm
Find the luminous flux Φv in lumens (lm) when the luminous intensity Iv in candela (cd) is 700cd and the apex angle is 60°:
Φv(lm) = 700cd × ( 2π(1 - cos(60°/2)) ) = 589.2 lm
Find the luminous flux Φv in lumens (lm) when the luminous intensity Iv in candela (cd) is 900cd and the apex angle is 60°:
Φv(lm) = 900cd × ( 2π(1 - cos(60°/2)) ) = 757.6 lm
Candela to lumens calculation ►
Our Candela to lumens Calculator allows the users to Calculate Candela to lumens . Some of the prominent features of this utility are explained below.
You don’t need to go through any registration process to use the Candela to lumens Calculator. Using this utility, users to Calculate Candela to lumens as many times as you want for free.
This Candela to lumens Calculator offers users the fastest Calculate. Once the user enters the Candela to lumens values in the input field and clicks the Calculate button, the utility will start the conversion process and return the results immediately.
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You don't need to go through any registration process to use this Candela to lumens Calculator. You can use this utility for free and do unlimited Candela to lumens Calculate without any limitations.
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