It’s not really clear what we are looking at in your results. All I can say is that a point-in-time illuminance simulation of electric lighting is accurate and trustworthy as long as you set it up correctly. Maybe you should upload your .gh file with the .ies file so people can see specifically what you are asking.
There’s no good way to simulate Luminare’s in Radiance for an entire year without running a separate point-in-time illuminance simulation for each hour. I would recommend trying to run illuminance simulations of “typical days” to get a sense of illuminance conditions with your .ies file and various solar positions.
Thanks Chris for the reply.
Maybe I explained a little vaguely. I mean collecting illuminance in the point-in-time; Assuming that in addition to daylight entering the space from the window, the electric lights are on at the same time. For example, in a sunny sky, at 12 noon.
But given the unusual pattern of light distribution in such a simulation, I have some doubts. combination of lighting and daylight.gh (554.3 KB)
also You are right about the annual simulation discussion. it is not possible.
Thank you so much @chris and also @minggangyin for spend your time.
Yes, with increasing -ab, it seems a bit more logical. But again, I do not think it can completely solve the difference in the illuminance spectrum between daylight and electric light. Maybe this is a bug. anyway I try to solve this issue to some extent by changing the band (min and max).
And the question I had; How did you create countour lines?