Photometry

Irradiance

E_e

W/m²

		x
W/m²

Φ_e

		x
W

S_r

m²

rad

1. Define values of all variables, besides sought quantity
2. Change units if necessary
3. Click "Calculate"

		variables: E_e - irradiance, i.e. radiated power per unit of area of receiver surface (radiant flux surface density) Φ_e - radiation (or absorption) power, radiant flux S_r - area of surface of radiation detector α - angle between direction of radiation propagation and normal to surface