General Category > General CG Discussion

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

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dj_buckley:
Whatever looks 'right' is often much better than whatever is 'accurate'.

Howver, let's stick at it.  Can you screenshot your exposure settings and the IES lights default settings/values?

I'm assuming sun and sky are just left at default values

dj_buckley:

--- Quote from: Philip kelly on 2024-08-12, 15:13:23 ---if i do what every i want it's not accurate then ....................

--- End quote ---

Also this is why I questioned exposure first.  You can underexpose or overexpose or correctly expose.  They're all technically accurate (assuming the IES files are accurate) but they won't necessarily look good.

Adjusting the light intensity is pretty much the same as adjusting exposure.  Adjusting just the lights gives you much more control though because exposure is global and the lights are individual.

As I say, the falloff and pattern of the IES will remain accurate so does it really matter if you adjust the intensity to your liking, because all you're effectively doing is the same as adjusting the exposure, just on an individual light.

Something else to add.  How are the materials setup? Where are the IES lights placed in the model?  Are they placed exactly where the bulb would be?  If so does that mean they're behind a glass material that you've made?  How closely does that glass material match the glass material of the actual bulb? etc etc etc

In other words, you can fixate on accuracy or you can just do whatever looks good in a fraction of the time :)

Philip kelly:
Thanks again for the feedback. I can't put an image up, client NDA.
Light is just above a the glass of the light, I am using IES files provided by manufacturer, and they just seem very week.
The street light setting of the IES seems very low also.

I will keep going and hopefully get a solution. Thank you .
Phil

dj_buckley:
Can you share the IES file or at least screenshot the IES file default settings, you can blur everything else out.  Keen to know what their default values are

dj_buckley:
Also for what it's worth, I've just tested a couple of IES lights with Corona and the intensity value doesn't change at all despite them being wildly different lights.

So it looks like it's up to you to dial in the correct intensity.

Most sites that provide the IES files should also tell you the correct lumen value?  This is a good starting point I guess

I've attached an example from the ERCO website

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