This formula is important because it allows the albedo to be calculated for any given illumination conditions from a knowledge of the intrinsic properties of the surface.
ðɪs fˈɔːɹmjʊlə ɪz ɪmpˈoːɹtənt bɪkˈʌz ɪɾ ɐlˈaʊz ðɪ ælbˈiːdoʊ təbi kˈælkjʊlˌeɪɾᵻd fɔːɹ ˌɛni ɡˈɪvən ɪlˌuːmᵻnˈeɪʃən kəndˈɪʃənz fɹʌm ɐ nˈɑːlɪdʒ ʌvðɪ ɪntɹˈɪnsɪk pɹˈɑːpɚɾiz ʌvðə sˈɜːfɪs.