A diffusor with increased transmission has a higher error in cosine matching, but there exist applications where this can be tolerated. One example is the measurement of point like sources as vehicle lamps in a longer distance. Therefore, two modified diffusors are offered as accessory for specbos 1211-2, spectraval 1501 and spectraval 1511 - a version with medium transmission and a version with high transmission:

The transmission of the medium version is 20 times higher and the transmission of the high version is 60 times higher than that of the standard diffusor version.