 ## Spatial angle

### Spatial angle alternativ 1

Input Result
Area of the surface Ah= m2
The area of the sphere As= m2
Spatial angle ω= sr

### Spatial angle alternative 2

Input Result
Luminous flux Φ= lm
Luminosity I= cd
Spatial angle ω= sr

### Spatial angle alternative 3

Input Result
Illuminance E= lux
Lighting area Ay= m2
Luminosity I= cd
Spatial angle ω= sr

### Spatial angle alternative 4

Input Result
Illuminance E= lux
Luminous flux Φ= lm
Distance r= cd
Spatial angle ω= sr

### Spatial angle alternative 5

Input Result
Lighting area Ay= m2
Luminous flux Φ= lm
Distance r= m
Luminosity I= cd
Spatial angle ω= sr

### Spatial angle alternative 6

Input Result
Lighting area Ay= m2
Luminous flux Φ= lm
Distance r= m
Illuminance E= lux
Spatial angle ω= sr

### Area of the surface

The area on the surface that the spatial angler cuts into a sphere.

### The area of the sphere

Refers to the area of the sphere.

### Distance

The distance from the light source to the illuminated surface.

### Lighting area

The area on the flat surface that is illuminated.

### Illuminance

Refers to the light that hits the current surface.

### Luminous flux

The total luminous flux that radiates from the current light source.

### Luminosity

Refers to concentration of light in one direction.

### Spatial angle

The one which spreads the light measured in steridians.

### Formula

Spatial angle:       