Desktop Radiance and IES plus new question on RGB

radiance-general
1

Thank you, both of you. But I was referring to the IES files from lighting
manufacturers as Greg said. Sorry for not being clear... ies2rad seems to be
exactly what I'm looking for.

Should the following be a new topic?

For something like the following (which is part of a converted IES file, I
think). But regardless, "glow" requires you to specify "red" "green" and
"blue" values. In the following they are equal: 9477... for each.

lamp_glow glow lamp
0
0
4 9477.696528 9477.697093 9477.697093 0
So what units are these values in? This ratio of R to G to B shows up in
other parameters too (light, illum). Is there a max value to these RGB
values or for their total? That's one basic thing I've always been confused
about.
Thank you,
Nick

2

hi
have you crack of IES <Virtual Environment> v5.85 for revit architecture?
could send it to me?
thank

3

Please refrain from making any illegal requests or exchanges through our mailer, or we will bar you from future communications.

Thanks,
-Greg

···

From: "Nguyen Dong Nhat" <[email protected]>
Date: May 23, 2008 6:33:13 AM PDT

hi
have you crack of IES <Virtual Environment> v5.85 for revit architecture?
could send it to me?
thank

4

Hi Nick,

The glow values (multiplied by whatever pattern is applied) are in units of watts/steradian/sq.meter, or SI radiance. There is no maximum, and values below zero are even permitted in cases where you are outside the standard RGB gamut. You can compute luminance (in cd/m^2) from these values by applying the formula:

  Lumiance = 179*(0.2651*Red + 0.6701*Green + 0.0648*Blue)

I hope this helps.
-Greg

···

From: "Nick Calcagni" <[email protected]>
Date: May 22, 2008 11:38:57 AM PDT

Thank you, both of you. But I was referring to the IES files from lighting manufacturers as Greg said. Sorry for not being clear... ies2rad seems to be exactly what I'm looking for.

Should the following be a new topic?

For something like the following (which is part of a converted IES file, I think). But regardless, "glow" requires you to specify "red" "green" and "blue" values. In the following they are equal: 9477... for each.

lamp_glow glow lamp
0
4 9477.696528 9477.697093 9477.697093 0
So what units are these values in? This ratio of R to G to B shows up in other parameters too (light, illum). Is there a max value to these RGB values or for their total? That's one basic thing I've always been confused about.
Thank you,
Nick