still looking...
where's Nemo?
My guess is,
\(\lambda_{ne}=460\,nm\), which is also the solar irradiance peak.
\(a_{\psi\,ne}=\cfrac{\lambda_{ne}}{2\pi}=\cfrac{460*10^{-9}}{2\pi}=7.321\text{e-8}\,m\)
\(a_{\psi\,ne}=7.321\text{e-8}\,m\)
Have a sunny day.
