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Hi guys. I am trying to get this to work but am stuck right now.

Is there a way to control the light intensity of an IES/Eulumdat light? I want to use the IES lights to recreate a moody indoor scene instead of using just normal triangles as my light emitting object. When I add Physical Sky light everything gets washed out and I have to lower my Ev number to 1, just to get any visible light from these IES lights.

Am I doing something wrong here?

How can you use a IES lights in lets say a room with a ceiling height of 7 meters and still get enough light at the floor plane? The blue IES cones don't even touch the flood no matter what I do. How can I scale these in order to get more light to the floor plane?

Maybe someone can shed a light for me!?

Cheers

Q2

Here's link that details the contents of the IES file -- there is a multiplier value in there you can change:

http://www.kxcad.net/autodesk/3ds_max/A ... ormat.html

Best,
Jason.

Hi Jason. Thanks a lot. I will give it a try!

Cheers from France!

Q2

As far as the intensity, you can open up the .ies file in notepad (you may have to temporarily change it to a .txt file) and you'll see a long list of numbers. You may have to play around a little bit, but I think typically it's the first 1.0 you come to (not 1, but 1.0) that changes intensity.

I would be careful though, as this is probably a workaround to whatever your problem is given your description. Ideally, you'd only use this to adjust the intensity a bit if, for example, your data is for a 60 watt bulb and you're using a 100 watt bulb in which case you'd change it from 1.0 to 1.66. But you really don't want to be entering in very large numbers like 20 or something to get the power you need. Instead you should find out what the real problem is. Is the IES data bad? (Probably not if it's from erco or somewhere like that). Is there something wrong with the scene scale? Are the lighting parameters realistic? (Sun power 1.0, etc.) Are you sure the ies material is being applied properly to your geometry?

If you're unsure of any of those things, maybe you could post the material or scene and have folks check it for you and see if there's something you're missing. I'd start by posting the .ies file.

-Brodie

I have used this before, it is a great little free IES maker/editor:

http://www.tom-schuelke.com/ies-gen3.exe

Thanks Brian and Brodie

Will give it a shot!

Cheers

Carsten

Wow, thanks Bubbaloo! That editors great!

Brian, thanks so much.

This tool is just perfect!

Cheers

Q!