which standard to be refered to get the LRV of different wall, ceiling and floor ?

Hi Leanne, I'm not sure that I understand the question. The LRV is a value that should be posted with the specifications of the materials you are using. I don't have a deep expertise in finding LRVs, but I don't know if there is a general table to refer to. I think the idea is that you get the specific material and contact the manufacturer or specifications for the value for that particular material.   Kera

I get this question a fair amount because of the v4 Interior Lighting credit (I work for Interface, a flooring manufacturer) and I can tell you that LRV (the "Y-value" is what you're looking for) is not necessariliy standard in manufacturer specs where the product comes in a wide variety of colors (color is the main thing that determines light reflectancy for our products).  For our products to contribute (LRV Y-value over 25), you will need to install VERY light colored floors, so there is an obvious trade-off in terms of showing soil.  We would never recommend flooring with an LRV Y-value over 25 (it's a 0-100% scale, 0 is purest black, 100 is a mirror) in a high traffic area or an area with infrequent maintenance.  We can provide LRV values for most products, but each color and style must be tested individually, which can be quite expensive.  I recommend using the non-flooring pathways for the Interior Lighting credit.