[Radiance-general] Gendaylit Visible radiation
Lars O. Grobe
grobe at gmx.net
Tue Feb 5 11:31:33 PST 2013
Hi Jan!
> just to avoid some confusion about input and/or output:
Thank you for the clearification, I was writing my latest message from
what I remembered on a phone...
So far, whenever possible, I have avoided the whole conversion and its
implied assumptions by using illuminance for input and -O 0, which
allows me to stay with the conversion by a luminous factor of 179 lm / W
as I use it everywhere else in Radiance. The weather data I use has a
column with photometric units, and as I am interested in luminance and
illuminance as the result of my simulations, I try to avoid introducing
any additional conversion. One should however be aware that fields in
weather data may actually be derived from models of luminous efficacy,
too, as not every station measures both irradiance and illuminance...
Cheers, Lars.
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