Is it possible to mamually edit spectrum?

How to construct ...
Locked
ya2018
Posts: 17
Joined: Tue Aug 21, 2018 12:40 am

Is it possible to mamually edit spectrum?

Post by ya2018 » Tue Aug 21, 2018 1:10 am

Hi, I am new to Dialux. I have just started using Dailux evo 8.0(64bit).

Please let me ask how to handle color temperatures of lamps.

--------------
Question
--------------
Is there any way to manually apply "spectrum" located under Colourimetric data?

I selected a LED lamp with color temperature 3500K from a manufactuer's catalog.
However, there is no choice for 3500K in Dialux evo 8.0. It only allows 3000K, 4000K, 5500K, and 6800K.
I would like to know if there is a way to apply 3500K to this lamp.

Image

kvkozierowski
Posts: 321
Joined: Mon Mar 19, 2012 9:29 am
Contact:

Re: Is it possible to mamually edit spectrum?

Post by kvkozierowski » Tue Aug 21, 2018 6:51 am

Hi ya2018,

Yes, it is possible to assign a 3500K spectrum to your lamp:
spectrum.PNG
spectrum.PNG (21.4 KiB) Viewed 233 times
Best Regards
Kolja

ya2018
Posts: 17
Joined: Tue Aug 21, 2018 12:40 am

Re: Is it possible to mamually edit spectrum?

Post by ya2018 » Fri Aug 24, 2018 1:58 am

Hi, kvkozierowski

Thank you for a quick reply.

As you pointed out, I can now change the color temperature.
Thank you!

I want to make sure one more thing. If I change the color temperature in the way you pointed out, is the CRI value now considered to be 100(the spectrum contains all colors(purple to red)?
image01.png
image01.png (61.2 KiB) Viewed 213 times
Kind regards,
ya2018

kvkozierowski
Posts: 321
Joined: Mon Mar 19, 2012 9:29 am
Contact:

Re: Is it possible to mamually edit spectrum?

Post by kvkozierowski » Fri Aug 24, 2018 6:34 am

Hi ya2018,

The CRI value at this point is calculated from the spectrum but we do not calculate it for black body spectra as it would not really make sense. The CRI value is just an information that does not have any effect on the documentation or calculation. You should enter the CRI value of your lamp at the point "Colourmetric data for documentation". This is the value which will be printed in the documentation.

For calculations evo does calculate the resulting spectrum from the lamp spectrum (in this case a black body spectrum with colours from purple to red) and colour filters. The calculation of your scene (e.g. room) is done in R, G, B because a calculation for each wavelength would be way to slow and in almost all real cases there would not be any difference visible.

In short there are two relevant points:
"Colourmetric data for documentation" for the documentation
"Colourmetric data" for visualization

If you would like to have it "100% correct" you need a lamp with the correct measured spectrum from the lamp manufacturer.

Best regards
Kolja

ya2018
Posts: 17
Joined: Tue Aug 21, 2018 12:40 am

Re: Is it possible to mamually edit spectrum?

Post by ya2018 » Mon Aug 27, 2018 4:48 am

Hi, kvkozierowski

Thank you! I now understand what is going on behind evo.

I compared two result: one with planck radiator 5500K and the other LED 5500K.
As far as I can tell, my monitor does not show any difference.

Best regards,
ya2018

Locked

Who is online

Users browsing this forum: No registered users and 1 guest