General Category > General CG Discussion

Accurate Lighting, With IES profiles....Possible or Not ?

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Philip kelly:
Thank you again, your very good to answer this.
I have brought in the correct IES files and set the Lumen as per the manufacturers settings and on the Data sheets, so thank you , for that.
I have an engineer looking at it now, and it will be interesting to see there take on it, as there are so many factors involved in getting the realistic look,  and its not what everybody sees every day as we walk around in the evening.
I will let you know. I can sends image privately if that is any good.

Phil

nauticus25:
I've done some lighting studies as well. I'll use IES files when available, and ensure the lumen output matches what was specified by the lighting designer. Assuming you've done that with all your lights, then you can be reasonably confident that the light levels of your various lights are accurate ... relative to each other. That's the important bit to communicate to the client. The overall exposure of the image is an artistic interpretation of what "looks good", just like what your eyes and real world cameras do.

The Corona Sun and Sky have arbitrary Intensity numbers with 1.0 being "physically accurate". We have to assume that the output of the lights relative to the output of the sun is accurate, but I wonder if the devs have any data that can be provided to verify what "physically accurate" means.

The old Mental Ray render engine used to have light meters you could use to verify your light levels. Without light meters in Corona, you don't have a solid data point to hand to your client to back up your claim of accuracy. The best you can do is explain your process and remind them that at best, rendering is an artistic interpretation and that the final result will look different on different monitors, phones, prints, etc.

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