Cone Lumens Calculator
Compute cone lumens Φ = I·2π(1−cos(θ/2)) from intensity and beam angle.
Input Data
Input Luminous intensity I.
cd
Input Beam angle θ.
°
Results
214.0943lm
Φ = I·2π(1−cos(θ/2)).
At a glance:Cone Lumens Calculator: enter parameters to compute results; complements related calculators.
Formula
Φ = I·2π(1 − cos(θ/2)).
How to Use
- Enter luminous intensity and beam angle (deg).
- It returns total cone lumens.
Case Studies
I=1000 cd, θ=30° → Φ≈214.1 lm
Φ = 1000·2π(1−cos15°) ≈ 214.1 lm.
FAQ
Vs isotropic lumens?
Isotropic I gives Φ=4πI; here only the cone fraction, smaller angle → fewer lumens.
Related Tools
References
Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.