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Display Calibration Light Illusion Forums / Display Calibration /  
 

Foot Lambert

 
Author Turnip
ZRO
Male
#1 | Posted: 25 Nov 2022 09:12 
Hi! Is there an option in ColourSpace DPS to present the light measurement in Foot Lambert instead of Nits?
Regards,
Jan

Author Steve

INF
Male
#2 | Posted: 25 Nov 2022 09:48 
Foot Lamberts have not been used for brightness measurements for any displays - monitors and projectors - for some time, and were removed from LightSpace/ColourSpace a long time ago.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author Turnip
ZRO
Male
#3 | Posted: 28 Nov 2022 07:49 
We are using Foot Lamberts every time for measurements in our visual systems, so I don't think it's obsolete everywhere.

Jan

Author Steve

INF
Male
#4 | Posted: 28 Nov 2022 08:23 
We know of no display standard that still uses FtL?
What is your visual system, and why are you using FtL?

Steve
Steve Shaw
Mob Boss at Light Illusion

Author Turnip
ZRO
Male
#5 | Posted: 28 Nov 2022 08:38 
In flight simulator visual systems every manufacturer always use FtL in the specifications. Guess it has historical reasons.

Author Steve

INF
Male
#6 | Posted: 28 Nov 2022 08:43 
Do you have the specification standard documents?
All such setups we have ever seen used nits.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author Turnip
ZRO
Male
#7 | Posted: 28 Nov 2022 09:00 
Here are some information: https://www.easa.europa.eu/en/downloads/46529/en
I see that they specify both cd/m and FtL, for brightness, but I think it's more common to use only FtL, at least what I have seen.

Jan

Author Steve

INF
Male
#8 | Posted: 28 Nov 2022 09:11 
Thanks for the link.
Based on reading that, I would use nits (Cd/m), as FtL is in brackets as a secondary measurement option.

Steve
Steve Shaw
Mob Boss at Light Illusion

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Display Calibration Light Illusion Forums / Display Calibration /
 Foot Lambert

 

 
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