Candela to Lumens Converter
Convert luminous intensity (candela) to luminous flux (lumens) based on the beam angle of the light source.
cd
degrees
Lumens
314.2
Candela to Lumens
Lumens = Candela x 2pi x (1 - cos(theta/2))
Where theta is the beam angle in radians.
A narrow-beam spotlight and a wide floodlight can have the same candela but very different lumens.
Example Calculation
100 candela light source with 120° beam angle.
- 01theta/2 = 60° = pi/3 radians
- 02cos(60°) = 0.5
- 03Lumens = 100 x 2pi x (1 - 0.5) = 314.2 lumens
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