Opaque materials reflectance: LRV or L* ?

Locked
Clem&D
Posts: 10
Joined: Thu Dec 24, 2015 9:33 am

Opaque materials reflectance: LRV or L* ?

Post by Clem&D » Thu Jun 22, 2017 3:00 pm

Greetings,

I have a question regarding the definition of opaque materials in Dialux.
Based on manufacturer specifications, 2 parameters co-exist to define reflectance :
- Light Reflectance Value (LRV): total quantity of visible light reflected by a surface ;
- L* : visual contrast.

Dialux database seems to use L* as reference for reflectance definition, while LRV would seem more appropriate.

Which parameter would you recommend using for materials definition in Dialux?

Best,

Clément

Light brown material with 34% reflectance: L* seems to be used.
Image

Paremeter definition from DESSO (carpet tiles):
Image

Csuleiman
Posts: 763
Joined: Wed Mar 07, 2012 3:07 pm

Re: Opaque materials reflectance: LRV or L* ?

Post by Csuleiman » Fri Jun 23, 2017 7:22 am

Dear Clem&D,

DIALux uses L* for reflectance definition. The value for reflection (which is Rho in DIALux) indicates how much of the arriving light is being reflected. Please mind that values over 80% are barely present in practical life. Therefore DIALux is limited to a value of 90%. The reflection factor in DIALux is calculated using the RGB-values.

Best regards,
DIAL Support Team

Clem&D
Posts: 10
Joined: Thu Dec 24, 2015 9:33 am

Re: Opaque materials reflectance: LRV or L* ?

Post by Clem&D » Fri Jun 23, 2017 1:31 pm

Thanks for the quick answer.

Best,

Clément

Locked

Who is online

Users browsing this forum: No registered users and 2 guests