Dear all,

I’ve been working on a solar altitude dependant conversion factor between irradiance in watt pr. m2 and photosynthetically photon flux density in micromoles pr. m2 pr. s.

In order to find the correct conversion factor I need to know the radiation spectrum used by Radiance.

I’m using both Ladybug and Honeybee[+] to do analysis, but I assume that the Radiance computations use the same spectrum. I assume the radiation spectrum goes beyond the visible spectrum, but how much? My estimate is that it goes from 280-4000 nm. Though I can’t seem to find any information of the topic on Radiance’s page.

I hope that some of you have some insight you would like to share would me.

/Lasse Korsholm