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Kerkythea Rendering System • View topic - IES data Sheet
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IES data Sheet

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Fletch

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Post Fri Jan 18, 2008 5:26 pm

Hi jj.
I thought the same thing! ;)
I would put the tracklight closer to the wall and aim it a bit more down, so it mimics what we see in the 'real world' situation a bit better.

other than that... looks great - and I think that scene will come in handy to post for people to play with.


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Fletch

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Post Fri Jan 18, 2008 5:30 pm

G,
I think Dan is saying we need someone to take the initiative and set up a group of models that are coupled with an IES spot in KT that is loaded with the IES info from the actual fixture you have the model for.

It would be great to have not only the IES, but the model to go along with it... a nice IES Lighting pull-down model insert menu would be great! ;)

It's very possible, Dan, just need someone to actually make it. :roll:
It will take time. Hopefully after the release we will provide a little 'how-to' video to show how to do this for a single IES light fixture... and then someone out there will, out of the "goodness of their hearts", create a full 'model library' of a few common lights.


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jenujacob

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Post Fri Jan 18, 2008 5:46 pm

fletch i intially did point the track light as u mentioned above... but that would conflict with the light comin from the desklight.. so hence i decided against it...
i was playing with the other IES lights. as u can see in the preview... i used 15.ies with radiance value 1.0 (the default) and no exposure changes (that thing is bright enough) as u can see we cannot see those IES ripples (is that the correct jargon for it?? :oops: )
so i was thinking of reducing eitther the radiance value or the multiplier value to say maybe 0.5?? but which one is correct??
from what i gather, playing with any value on IES lights would be wrong... after all these things are supposed to emulate the real thing...
anyways is it ok (just for illustrative purposes) that i change the radiance or multiplier values so that the 'ripples' could actually be seen????? :?
Attachments
15.ies_rad_1.0.jpg
radiance value maintained at 1.0
15.ies_rad_0.5.jpg
radiance value reduced to 0.5

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Avariant

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Post Fri Jan 18, 2008 5:50 pm

Great scene guys. Definitely captures the lighting. My only issue is that for a library, aren't the images supposed to by 96x96? I think we'll need a smaller, simpler solution for that. Though for testing purposes, this one is awesome!

I found a thread on cgtalk with a long list of light manufacturers that provide ies lights.

I haven't looked through them all, just the first 5 or 6. So many lights...

lithonia http://www.lithonia.com/Library/IESFile ... a_Lighting
GE http://www.gelighting.com/na/business_l ... nloads.htm
Philips http://www.nam.lighting.philips.com/us/ ... php?mode=1
Erco http://www.erco.com/news/en/en_frameset_news.htm
Color Kinetics http://www.colorkinetics.com/support/ies/
http://www.deltalight.com
(DownloadCenter>EN>2.Download ALL IES in zip)
Cooper Lighting http://www.haloltg.com/common/CLDownloa ... brand=Halo
http://www.lumec.com/ (includes pdfs in the zip)
Peerless http://www.peerless-lighting.com/peerli ... hnical.asp
Sterner http://www.sternerlighting.com/PhtmtrcDB/PhtmIndex.html (looks like all outdoor lighting)
http://www.deltalight.com
http://www.haloltg.com/
http://www.lumec.com/
http://www.peerless-lighting.com/
http://www.sternerlighting.com/
http://www.bega-us.com/
http://www.lsi-industries.com/
http://www.louispoulsen.com/
http://www.martinilight.com/martiniweb/ ... metrie.asp
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Fletch

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Post Fri Jan 18, 2008 7:10 pm



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jenujacob

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Post Fri Jan 18, 2008 7:19 pm


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Avariant

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Post Fri Jan 18, 2008 7:41 pm

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Dan

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Post Fri Jan 18, 2008 8:40 pm

I think that all manufacturers provide almost the same types of fixtures for their lamps and, for the beginning, one could chose the most complete offer for building an initial model library (or chose the most usual luminaires from divers manufacturers).

BTW, Chris, I downloaded all the Erco IES files and none of them can be rendered in IES Viewer 2.99 n. They come and are rendered OK in KT, though. Do they use data that IES Viewer can't read?
Regards!
Dan
....................................................................
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Avariant

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Post Fri Jan 18, 2008 9:31 pm

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giannis

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Post Fri Jan 18, 2008 10:06 pm

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Avariant

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Post Fri Jan 18, 2008 11:07 pm

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Avariant

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Post Sat Jan 19, 2008 6:13 pm

I think I figured out why erco data isn't showing up in the IES Viewer. The files are text files and the data that actually defines the light profile is usually separated by spaces between each number. The erco files have tabs between each number. IES Viewer doesn't handle that, but KT, being a model of modern software, handles it just fine. 8)

If you want to use those files in IES Viewer, you'll have to replace the tabs with spaces. I use jEdit and it does it in 0.1 seconds so it's not a big deal, but up to you whether you want to do all that work ;)
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Fletch

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Post Sat Jan 19, 2008 7:59 pm

Avariant, you are right about the previews, but for what jj and I want, this scene is cool ;)

jj,
try this one... I've moved the track light closer to the wall... perhaps it could be tweaked to aim slightly more downward, but this one is pretty nice, I think.

Perhaps if we loaded an actual IES that IS a wall sconce, then we could see more clearly if that cove light above it obscures it too much for us... I have a feeling it will.

I liked the evenly divided shelving on the left wall to see quickly shadows cast from a nearby can light... but perhaps we will need to clean off that wall and mount the sconce there?

The major prob I see with IES as they render at about 95% the time an emitter takes... where a kt spot renders at approx. 50% the time an emitter takes. :?

So I will go very carefully with IES lights, choosing them only when absolutely critical.

but, man, they look great!
Attachments
IESLightboxR1_500px_IES1_5lightsOn.jpg
IESLightboxR1.zip
(143.93 KiB) Downloaded 75 times


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giannis

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Post Sat Jan 19, 2008 8:59 pm

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jenujacob

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Post Sat Jan 19, 2008 9:02 pm

fletch,
i did a quick google for sconce IES lights and found ... u can download the IES files from

i made a quick render with only the sconce on ur updated scene.. and i do think the racks on the left wall must make way to the sconce! ;)
Attachments
sconce IES test.jpg

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