It won't be of much help to you probably, but EN 12464-1:2002 (paragraph
4.2) gives you a range of reflectances for interior surfaces:
— ceiling: 0,6 to 0,9
— walls: 0,3 to 0,8
— working planes: 0,2 to 0,6
— floor: 0,1 to 0,5
Thank you, it is of help, as I need a quoteable source when setting up
my yet unknown materials!
CU Lars.