Governing equation: Flux = ∫Intensity * cos(q) dΩ
∫   ∫    Intensity* cos(q)sin(q) dq df
2p
p/2
0
0
In spherical coordinates:
Flux =
Solving the integral using m= cos(q) gives us:
Flux = Intensity * Ω
To go from the spectrum from VisRad to a boosted up spectrum:
Flux (Dante at the LEH) = Flux (Dante from VisRad)* p /Solid Angle of the LEH
So our correction factor to convert the Dante spectrum from VisRad to the Dante spectrum at the LEH is
p/(Solid Angle of the LEH) = 1.962 x 106   (in our simulation, the DANTE surface is at 100 cm)
Converting the VisRad DANTE spectrum to the DANTE spectrum at the LEH
Note: A similar correction is made to the radiation temperature on DANTE calculated by VisRad.  See http://astro.swarthmore.edu/~cohen/presentations/DANTE-convfac-VisRad.pdf for more details on these corrections.