Okay, after spending all day trying to get this, I just did it after minutes of posting this topic, typical. Substituting c=lambda*nu into the last equation and canceling down/simplifying gets you to the result in the other textbook. Peace of mind at last :blushing:
We're covering flux/luminosity/magnitudes etc in Astrophysics module at the moment but I'm getting myself into a bit of a muddle when it comes to flux.
We've been given monochromatic and bolometric flux equations, both with respect to wavelength and with respect to frequency.
And I'm trying...