Hi,
when I import a .dat file containing the daylight factors calculated by Radiance, I always get an incongruence between what is written inside the file and what I read on the Ecotect grid.
In a specific manner, the numbers shown in Ecotect, as well as the average value, are increased by a 179 factor.
For instance: the very same point, which I can identify by coordinates, reads 0.59% in Ecotect while the .dat file says 0.0033.
Is there a good reason for that?
Thanks
Matteo.
architecture, sustainability, building performance, environmental design, architectural science...
Radiance daylight factor
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answer
the reason is that with rtrace Radiance calculate the Irradiance (W/m2), which is written in the .dat file, and it has to be converted in lux: the conversion factor is 179 lumen/W, which is the luminous efficacy of daylight used by Radiance.