I wonder if anyone has experience with PAR (Photosynthetically Active Radiation)? Is it simply a fraction of Solar Irradiance? If yes, how much is this fraction? Based on this source https://core.ac.uk/download/pdf/29218727.pdf (Appendix A), it is 43%. A quick comparative study between the 43% fraction and Ecotect (generally outdated, but the only software I know that outputs PAR, although I have no idea what calculation is using), gives a constant deviation of some 10% tested on a single fully exposed surface in various locations.

Any idea if this approach is correct? Any intention of including PAR as a default ladybug output?

Thanks in advance!