Dialux 4 LOR

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64_Richard
Posts: 58
Joined: Wed Aug 02, 2017 7:57 am

Dialux 4 LOR

Post by 64_Richard » Tue Feb 02, 2021 1:25 pm

Good afternoon,

I noticed yesterday when importing ldt files into 4 it doesn't take account of the LOR.
Example: an emergency light had a lamp output of 535 lm with an LOR of 26%.
When imported into 4 it shows and calculates as 535 lm.
I imported the same file into Evo and it gave the lm value as 144.
Why is this please?

Csuleiman
Posts: 2120
Joined: Wed Mar 07, 2012 3:07 pm

Re: Dialux 4 LOR

Post by Csuleiman » Wed Feb 03, 2021 7:45 am

Hello 64_Richard,

Please provide us with the DIALux project file so that we could check the problem directly in DIALux 4.13. Besides this, please send us also some screenshots showing the problem in details.
It would be of help if you could send us the link to this topic so that we could better assign this issue. Our email address is 'Support@dial.de'.

Best regards,
DIAL Support Team

64_Richard
Posts: 58
Joined: Wed Aug 02, 2017 7:57 am

Re: Dialux 4 LOR

Post by 64_Richard » Wed Feb 03, 2021 10:53 am

Thanks.
Here are screenshots of the original .ldt file.
Screenshot 2021-02-03 at 10.11.57.png
Screenshot 2021-02-03 at 10.11.57.png (29.04 KiB) Viewed 1040 times
Screenshot 2021-02-03 at 10.12.09.png
Screenshot 2021-02-03 at 10.12.09.png (58.37 KiB) Viewed 1040 times
Screenshot 2021-02-03 at 10.11.41.png
Screenshot 2021-02-03 at 10.11.41.png (46.19 KiB) Viewed 1040 times

64_Richard
Posts: 58
Joined: Wed Aug 02, 2017 7:57 am

Re: Dialux 4 LOR

Post by 64_Richard » Wed Feb 03, 2021 11:00 am

I carried out a sample test in Dial 4.13
I set up a room 1m high with the luminaire centred with a horizontal calc point on the floor directly below.
Screenshot 2021-02-03 at 10.16.05.png
Screenshot 2021-02-03 at 10.16.05.png (15.4 KiB) Viewed 1040 times
The file shows 535lm.
Screenshot 2021-02-03 at 10.15.55.png
Screenshot 2021-02-03 at 10.15.55.png (14.61 KiB) Viewed 1040 times
The lux level is calculated at 25lx
Screenshot 2021-02-03 at 10.16.41.png
Screenshot 2021-02-03 at 10.16.41.png (49.64 KiB) Viewed 1040 times
Which working on 46 cd/klm gives us 543 lm @ 0 degrees 1m. Which allowing for a few tolerances is near enough to 535.

64_Richard
Posts: 58
Joined: Wed Aug 02, 2017 7:57 am

Re: Dialux 4 LOR

Post by 64_Richard » Wed Feb 03, 2021 11:12 am

Now, I did the same in Evo 9.2.
Screenshot 2021-02-03 at 10.19.39.png
Screenshot 2021-02-03 at 10.19.39.png (9.56 KiB) Viewed 1040 times
This time the lm level showed 144...which takes account of the LOR Factor
Screenshot 2021-02-03 at 10.20.18.png
Screenshot 2021-02-03 at 10.20.18.png (22.26 KiB) Viewed 1040 times
I carried out a calc using direct light to replicate the Dial 4 project
Screenshot 2021-02-03 at 11.04.55.png
Screenshot 2021-02-03 at 11.04.55.png (31.49 KiB) Viewed 1040 times
This time i still got the same (near enough 27.6) lx level as in 4
I can't upload the screenshot.

Which gives the lm level at 600lm which again is way more than the 144 lm it shows.

Am I doing something wrong, is it the ldt file or is it the software?

Csuleiman
Posts: 2120
Joined: Wed Mar 07, 2012 3:07 pm

Re: Dialux 4 LOR

Post by Csuleiman » Fri Feb 05, 2021 7:53 am

Hello 64_Richard,

The reason for the discrepancies in the results of the calculation point is that you have compared two different projects. So we tried to adjust them so that they have identical settings. You have used an emergency light scene in DIALux 4 and compared this scene in evo with the direct calculation.

In DIALux evo the emergency lighting is not yet implemented and we would not like to advise you to simply set all reflectance values to zero, as this procedure does not comply with the DIN EN 1838 standard.
After a new reading of the standard, the designer can take the first reflection into account. In evo it is indeed possible to calculate "only directly", but neither this way nor 0% reflectance would be a solution. In this case, a corresponding calculation procedure must first be implemented in evo.
Furthermore it is not possible in evo to create the output of a "real" escape route or an anti-panic surface. It is explicitly required to keep 1lx on the centerline and 0.5lx on half width. These results are not available in evo.
Many products of our partners (especially English manufacturers) have (had) luminaires with emergency lighting LEOs in the plug-ins. These are only used if an emergency lighting scene is available. In evo you cannot "switch on" these. So you cannot use the luminaires with emergency lighting equipment.
For this reason, we can only recommend to calculate the emergency lighting in DIALux 4.13.

For the evo 10, the implementation of the emergency lighting is fixed. Our colleagues are already working on the exact implementation.

Regarding the luminous flux:

The value which you see in the luminaire tool is the luminaire luminous flux. In general, the luminaire luminous flux is calculated by the measured luminous intensities. The lamp luminous flux will be taken and calculated as luminaire luminous flux automatically in evo.
The other value shown in lamp tool is the total lamp luminous flux.

Light Output Ratio (LOR) [%] = luminous flux of the luminaire / luminous flux of the lamp

We have sent you via email both DIALux project files which should now be identical. So the results are also similar in both DIALux versions.

Best regards,
DIAL Support Team

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