Candela-zu-Lumen-Umrechner — Formel
## Candela to Lumens
**Lumens = Candela x 2pi x (1 - cos(theta/2))**
Where theta is the beam angle in radians.
- **Candela** measures intensity in a specific direction
- **Lumens** measure total light output in all directions of the beam
A narrow-beam spotlight and a wide floodlight can have the same candela but very different lumens.
**Lumens = Candela x 2pi x (1 - cos(theta/2))**
Where theta is the beam angle in radians.
- **Candela** measures intensity in a specific direction
- **Lumens** measure total light output in all directions of the beam
A narrow-beam spotlight and a wide floodlight can have the same candela but very different lumens.
Lösungsbeispiel
100 candela light source with 120° beam angle.
- theta/2 = 60° = pi/3 radians
- cos(60°) = 0.5
- Lumens = 100 x 2pi x (1 - 0.5) = 314.2 lumens