[Radiance-general] Groundhog Electric Lighting capabilities - validation challenge

Wed Mar 2 13:43:36 PST 2016

Hi Germán,

A few months ago, I had done some validation tests with AGI-32 while
implementing IES2RAD in Honeybee/Grasshopper. I think you can use the data
from my tests to validate your model in Groundhog. 

Here are a few details regarding the test model and simulations:

1.     The model, which was a simple rectangular room, was tested in AGI-32
(16.7)

2.     The room dimensions are 10m x 10m x 4m(height). The reflectances are
80%(ceiling), 50%(walls) and 20%(floor). The calculation grid was placed
0.001 meters above the floor and the points were spaced 2m x 2m with an
offset of 1 m from walls.

3.     The luminaire was located at (5m,5m,3.5). 

4.     I designed a crude 2k Factorial study with 3 levels to compare the
illuminance results from Spin, Tilt and Rotate angles in AGI-32 and
Honeybee. I also tested aiming according to a specific point as per the
C0-G0 coordinate system. The side-by-side comparison between the simulation
results can be found here:
https://www.dropbox.com/s/nj5e2nvltf8h1t5/Tests.pdf?dl=0 . 

5.     I assume that you are using Xform to position the luminaires after
creating the luminaires using IES2RAD. You can find the relationship between
(Spin, Tilt, Rotate) and the Xform-specific (rx,ry,rz) inputs here :
https://github.com/mostaphaRoudsari/Honeybee/blob/master/src/Honeybee_IES%20
Luminaire.py#L775-L784

6.     The luminaire used for the study was Lithonia 2VLTX4 30L LP835. You
can download the IES file from :
http://www.visual-3d.com/Tools/ProductInfo.aspx?get=ies
<http://www.visual-3d.com/Tools/ProductInfo.aspx?get=ies&guid=19674b27-15de-
4c31-8233-14e0bb72edab> &guid=19674b27-15de-4c31-8233-14e0bb72edab

Let me know if you need more details.

Sarith

-----Original Message-----
From: Guglielmetti, Robert [mailto:Robert.Guglielmetti at nrel.gov] 
Sent: Wednesday, March 02, 2016 2:46 PM
To: Radiance general discussion <radiance-general at radiance-online.org>
Subject: Re: [Radiance-general] Groundhog Electric Lighting capabilities -
validation challenge

Hey German,

Cool. I don't have time (or licenses) to do this testing, but I did want to
comment on the images. It looks like you're wrapping those track fixtures
with illum geometry. The spill of light on the ceiling appears to be
emanating from an illum sphere, as it's too close to the base of the
luminaire to be coming from the edge of the fixture itself. This is a case
where it would make more sense to translate the ies file to a ring. The
illum "wrapper" is more suited to large glowing luminaries, not so much for
directional fixtures like track heads.

- Rob

On 3/2/16, 10:52 AM, "Germán Molina Larrain" <
<mailto:germolinal at gmail.com%3cmailto:germolinal at gmail.com>
germolinal at gmail.com<mailto:germolinal at gmail.com>> wrote:

Hello everyone,

As some of you might have heard, it has been a while since I started
developing Groundhog (
<http://www.groundhogproject.org%3chttp:/www.groundhogproject.org>
www.groundhogproject.org<http://www.groundhogproject.org>), an OpenSource
SketchUp extension for performing Radiance Simulations.

I am writing you because one of the latest additions to the LATEST VERSION
correspond to the capability of simulating Luminaires from IES files. During
this process, I had to reproduce the IES2RAD to respect the policies of "if
you only want to export, then you do not need Radiance" and "you barely need
post-processing before performing a simulation".

What is missing, now, is to compare the results of this simulations with
some obtained from other tools (i.e. Dialux, Relux, AGi32, etc). Since I do
not have any of those programs, or a WINDOWS machine and is hard for me to
find the time for performing these comparisons, I decided to ask for this
awesome community for help.

Is there anyone who is willing to help me with this? I cannot really pay you
for it, but I can guarantee that you will get the require training and
support (remotely, probably).

HERE IS A LINK TO SOME SAMPLE IMAGES<
<https://drive.google.com/folderview?id=0B2NfkTSl19hQYUNZOFliMHp2dXc&usp=sha
ring>
https://drive.google.com/folderview?id=0B2NfkTSl19hQYUNZOFliMHp2dXc&usp=shar
ing>

In any case, you are welcome to download and try and use Groundhog as mucha
as you want.

Best,

Germán Molina,  <http://www.IGD.cl%3chttp:/www.IGD.cl>
www.IGD.cl<http://www.IGD.cl>

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