Photometry

Radiance

B_e

W/(sr·m²)

		x
W/(sr·m²)

Φ_e

		x
W

S_em

m²

rad

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

		variables: B_e - radiance Φ_e - radiation (or absorption) power, radiant flux Ω - solid angle S_em - area of surface of emitting source α - angle between direction of radiation propagation and normal to surface